People who do regular volunteer work tend to live longer, on average, than people who do not. It has been found that "doing good," a category that certainly includes volunteer work, releases endorphins, the brain`s natural opiates, which induce in people a feeling of well-being. Clearly, there is a connection: Regular releases of endorphins must in some way help to extend people`s lives.
Which of the following, if true, most seriously undermines the force of the evidence given as support for the hypothesis that endorphins promote longevity?
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APeople who do regular volunteer work are only somewhat more likely than others to characterize the work they do for a living as "doing good."
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BAlthough extremely high levels of endorphins could be harmful to health, such levels are never reached as a result of the natural release of endorphins.
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CThere are many people who have done some volunteer work but who do not do such work regularly.
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DPeople tend not to become involved in regular volunteer work unless they are healthy and energetic to begin with.
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EReleases of endorphins are responsible for the sense of well-being experienced by many long-distance runners while running.
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