One of its worst ever mass shootings in America occurred on Friday when 20 children and six adults were shot dead by a gunman who opened fire at an elementary school in Connecticut. The gunshot at Sandy Hook elementary school in Newtown, about 65 miles north-east of New York, is understood to have been carried out by a gunman, who was later found dead at the scene. State policeman Paul Vance said 18 children died at the scene and two more died in hospital Six adults were found dead at the school, Vance said.The bodies of the victims remain inside the school. In an emotional press conference at the White House, Barack Obama suggested that he may take action.Fighting back tears, he said: "We've tolerate too many of these tragedies in the past few years.And each time ] learn the news I react not as a president, but as anybody else would as a parent.And that was especially true today.I know there's not a parent in America who isn't in the same overwhelming sorrow that I am." Referring to a number of major shootings this year alone, Obama continued: "Whether it's an elementary school in Newtown, or a shopping mall in Oregon, or a temple in Wisconsin, or a movie theater in Aurora, or a street comer in Chicago - these neighborhoods are our neighborhoods, and these children are our children.And we're going to have to come together and take meaningful action to prevent more tragedies like this, regardless of the politics." From the speech, we can infer that Obama is   _  .
serious and supportive confused and worried delighted and satisfied sad and determined
Question: One of its worst ever mass shootings in America occurred on Friday when 20 children and six adults were shot dead by a gunman who opened fire at an elementary school in Connecticut. The gunshot at Sandy Hook elementary school in Newtown, about 65 miles north-east of New York, is understood to have been carried out by a gunman, who was later found dead at the scene. State policeman Paul Vance said 18 children died at the scene and two more died in hospital Six adults were found dead at the school, Vance said.The bodies of the victims remain inside the school. In an emotional press conference at the White House, Barack Obama suggested that he may take action.Fighting back tears, he said: "We've tolerate too many of these tragedies in the past few years.And each time ] learn the news I react not as a president, but as anybody else would as a parent.And that was especially true today.I know there's not a parent in America who isn't in the same overwhelming sorrow that I am." Referring to a number of major shootings this year alone, Obama continued: "Whether it's an elementary school in Newtown, or a shopping mall in Oregon, or a temple in Wisconsin, or a movie theater in Aurora, or a street comer in Chicago - these neighborhoods are our neighborhoods, and these children are our children.And we're going to have to come together and take meaningful action to prevent more tragedies like this, regardless of the politics." From the speech, we can infer that Obama is   _  .
A. serious and supportive
B. confused and worried
C. delighted and satisfied
D. sad and determined
Answer: