It was a sunny holiday Monday. Olivier Ferrante was cooking sausages on the barbecue and entertaining friends in his garden north of Paris when the phone  rang. The call came from the BEA, France's air accidents investigation bureau , where the 38-year-old former football player and driver was an investigator. The news was grim. "An Airbus is missing over the Atlantic: we need you." As a safety investigator,Ferrante and his teams had participated, directly and indirectly,in the recovery of crashed planes from the Red Sea, the Black Sea,and every ocean. But this investigation would be his toughest ever: the plane had disappeared without a witness, or a trace on radar . At least eight ships and a dozen military aircraft gathered on the plane's last  known position, about halfway between Brazil and Western Africa. After six days the aircraft's tail fin  and 50 bodies were spotted on the surface and the first burning questions were answered. The plane wreckage  and passenger injuries indicated the doomed Airbus was unbroken when it hit the water. It was not exploded apart by a bomb or lightning,  now broken up by violent weather. Strangely, no mayday  message had been sent by its pilots. Ferrante worked energetically with his team:collecting offers of help from around the world, consulting navy ministries and research organizations in France and elsewhere, and contracting suitable ships and high-tech equipment. He would not return home for another 29 days. His team used the Autonomous Underwater Vehicle(AUV) operated around the clock, searching about 400 square kilometers a day. But the race against time was lost and no signals were heard and no more wreckage was found. Day after day, the screen remained bare except for objects that turned out to be stones or garbage from ships.  Stressed by media attention and painful meetings with victims'  s,Ferrante went jogging one day to clear his head. Then he had an idea. He decided to look at what had happened to nine other planes that crashed after something abruptly went wrong while flying at high altitude. He found that none had traveled more than 30 km before hitting the sea; most covered less than half that distance. AUV operations continued but now they focused on a 30 km circle around the plane's last known position. On the ninth day of the new-strategy searching, after searching for 22 months, their hard work paid off finally. The first thing they saw was a woman's handbag. Next,they saw bits of twisted aircraft parts and a panel  with "AF" painted on it. Without a doubt,this was the missing Aribus,lying 11 km northeast of  its last known position, but nobody felt much like cheering the discovery. "The screen also exposed well-preserved human bodies,and for some of us they were hard to look at," says Ferrante. What made it take so long a time to find the missing Airbus?
The investigators were not working hard as it was holiday  time. No mayday message was sent by its pilots before crashing. Not enough investigating force was put into the searching work. The strategy used in the first stage of the search was not effective.
Question: It was a sunny holiday Monday. Olivier Ferrante was cooking sausages on the barbecue and entertaining friends in his garden north of Paris when the phone  rang. The call came from the BEA, France's air accidents investigation bureau , where the 38-year-old former football player and driver was an investigator. The news was grim. "An Airbus is missing over the Atlantic: we need you." As a safety investigator,Ferrante and his teams had participated, directly and indirectly,in the recovery of crashed planes from the Red Sea, the Black Sea,and every ocean. But this investigation would be his toughest ever: the plane had disappeared without a witness, or a trace on radar . At least eight ships and a dozen military aircraft gathered on the plane's last  known position, about halfway between Brazil and Western Africa. After six days the aircraft's tail fin  and 50 bodies were spotted on the surface and the first burning questions were answered. The plane wreckage  and passenger injuries indicated the doomed Airbus was unbroken when it hit the water. It was not exploded apart by a bomb or lightning,  now broken up by violent weather. Strangely, no mayday  message had been sent by its pilots. Ferrante worked energetically with his team:collecting offers of help from around the world, consulting navy ministries and research organizations in France and elsewhere, and contracting suitable ships and high-tech equipment. He would not return home for another 29 days. His team used the Autonomous Underwater Vehicle(AUV) operated around the clock, searching about 400 square kilometers a day. But the race against time was lost and no signals were heard and no more wreckage was found. Day after day, the screen remained bare except for objects that turned out to be stones or garbage from ships.  Stressed by media attention and painful meetings with victims'  s,Ferrante went jogging one day to clear his head. Then he had an idea. He decided to look at what had happened to nine other planes that crashed after something abruptly went wrong while flying at high altitude. He found that none had traveled more than 30 km before hitting the sea; most covered less than half that distance. AUV operations continued but now they focused on a 30 km circle around the plane's last known position. On the ninth day of the new-strategy searching, after searching for 22 months, their hard work paid off finally. The first thing they saw was a woman's handbag. Next,they saw bits of twisted aircraft parts and a panel  with "AF" painted on it. Without a doubt,this was the missing Aribus,lying 11 km northeast of  its last known position, but nobody felt much like cheering the discovery. "The screen also exposed well-preserved human bodies,and for some of us they were hard to look at," says Ferrante. What made it take so long a time to find the missing Airbus?
A. The investigators were not working hard as it was holiday  time.
B. No mayday message was sent by its pilots before crashing.
C. Not enough investigating force was put into the searching work.
D. The strategy used in the first stage of the search was not effective.
Answer: