A 15-year-old American has become the youngest person to climb the highest mountains on each of the seven continents, completing the feat by summiting Antarctica's Mount Vinson over the weekend.     Jordan Romero, who last year at age 13 became the youngest person to climb the world's tallest peak Mt Everest, was descending to base camp on Sunday after reaching the summit of Vinson Massif with a team that included his father and stepmother, according to his team's website. "We're at the roof of Antarctica," a member of Team Jordan said in a webcast from near the 4897-metre peak on a frigid but "legendary day".     Romero beat the record previously held by Britain's George Atkinson, who in May completed the seven ascents at the age of 16. The junior mountaineer from Big Bear Lake, California has been hooked on climbing from an early age. When he was just 10, he became the youngest person to climb Mt Kilimanjaro, Africa's highest peak at 5895 meters.     Before his 11th birthday, he had another world record under his belt, summiting Europe's Mt Elbrus, in Russia's Caucasus mountains, in July 2007. Five months later, it was the 6962-metre Mt Aconcagua in Argentina, followed by Alaska's Mt McKinley at 6194 meters. In September 2009 at age 13, he climbed Indonesia's Carstensz Pyramid, at 6194 meters the tallest island peak in the world, breaking another record. Eight months later in May 2010, he climbed Everest, and ever since he and his team had been preparing for his Antarctic expedition.     "Looking forward to tomorrow, and we'll make you guys proud and promise we'll come back home safe and sound," Romero said in a webcast on Saturday, hours before he began the final ascent to Mt Vinson's summit.     The team had intended to reach the top on Christmas Day, but ideal weather and good progress allowed them to summit a day ahead of schedule. According to the passage, which of the following can't be used to describe Romero?
Optimistic Strong-willed Ambitous Selfish.
Question: A 15-year-old American has become the youngest person to climb the highest mountains on each of the seven continents, completing the feat by summiting Antarctica's Mount Vinson over the weekend.     Jordan Romero, who last year at age 13 became the youngest person to climb the world's tallest peak Mt Everest, was descending to base camp on Sunday after reaching the summit of Vinson Massif with a team that included his father and stepmother, according to his team's website. "We're at the roof of Antarctica," a member of Team Jordan said in a webcast from near the 4897-metre peak on a frigid but "legendary day".     Romero beat the record previously held by Britain's George Atkinson, who in May completed the seven ascents at the age of 16. The junior mountaineer from Big Bear Lake, California has been hooked on climbing from an early age. When he was just 10, he became the youngest person to climb Mt Kilimanjaro, Africa's highest peak at 5895 meters.     Before his 11th birthday, he had another world record under his belt, summiting Europe's Mt Elbrus, in Russia's Caucasus mountains, in July 2007. Five months later, it was the 6962-metre Mt Aconcagua in Argentina, followed by Alaska's Mt McKinley at 6194 meters. In September 2009 at age 13, he climbed Indonesia's Carstensz Pyramid, at 6194 meters the tallest island peak in the world, breaking another record. Eight months later in May 2010, he climbed Everest, and ever since he and his team had been preparing for his Antarctic expedition.     "Looking forward to tomorrow, and we'll make you guys proud and promise we'll come back home safe and sound," Romero said in a webcast on Saturday, hours before he began the final ascent to Mt Vinson's summit.     The team had intended to reach the top on Christmas Day, but ideal weather and good progress allowed them to summit a day ahead of schedule. According to the passage, which of the following can't be used to describe Romero?
A. Optimistic
B. Strong-willed
C. Ambitous
D. Selfish.
Answer: