问题
单项选择题
A．Diet, optimism, activity or mobility, and genetics.
B．Optimism, commitment to interesting things, activity or mobility, and adaptability to loss.
C．The strength to adapt to loss, diet, exercise, and genetics.
D．Diet, exercise, commitment to something they were interested in, and genetics.
答案
参考答案：B
解析：[听力原文]
According to the researches, what were the four main themes or characteristics that all of the 96 centenarians have in common