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Which of following most logically completes the argument?
when people engage in activites 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 increase people's longevity.
And a statistic on adults who reguraly 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 longetivity , 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.
C: the feeling of well-being induced by endorphins can, at least for a time mask the symptoms of various conditions and dieases, provided the symptoms are mild.
这道题我看到a就选了 对了答案才知道是c 但我觉得a也可以呀? | 
