prep2-112 求助各位大侠

112. (GWD 26-Q31)

Which of the following most logically completes the argument?

When people engage in activities that help others, their brain releases endorphins, the brain’s natural opiates, which induce in people a feeling of well-being. It has been suggested that regular release of endorphins increases people’s longevity, and a statistic on adults who regularly engage in volunteer work helping others shows that they live longer, on average, than adults who do not volunteer. However, that statistic would be what we would expect even if volunteering does not boost longevity, because __________.

A. in the communities studied, women were much more likely to do regular volunteer work than men were, and women tend to live longer than men do

B. the number of young adults who do regular volunteer work is on the increase

C. the feelings of well-being induced by endorphins can, at least for a time, mask the symptoms of various conditions and diseases, provided the symptoms are mild

D. it is rare for a person to keep up a regular schedule of volunteer work throughout his or her life

E. some people find that keeping a commitment to do regular volunteer work becomes a source of stress in their lives

答案是A，可是我选C。这道题是说经常做志愿活动会使大脑分泌内啡肽增加从而使人感觉良好。而经常分泌内啡肽则会延长人的寿命。数据显示，经常做志愿活动的人要比不经常做的人的平均寿命长。但是，即使志愿活动并不能使我们延年益寿，这个数据仍然会是这样，因为。。。（不知道对不对）。

不明白为什么选A，请大侠指点！