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，但是我怎么觉得C对呢？
做善事的人大脑释放什么，似的他们感觉很好，然后就长寿，然后就认为释放的这种东西会让人长寿，而且一个统计也表明经常参加义务劳动的人们也比平均寿命要长。作者说，就算参加义务劳动的人没有延长寿命我们也可以预计到相同的调查结果，因为：因为参加的都是女性，女性的寿命本来就比平均寿命要长。
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