Ancient hunter-gatherers developed instincts that stigmatized selfishness, and voluntary cooperation was encouraged as well, whether it be within the group or also with outsiders.
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Aselfishness, and voluntary cooperation was encouraged as well, whether it be within the group or
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Bselfishness, encouraging voluntary cooperation as well, both within the group but
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Cselfishness and also encouraging voluntary cooperation, within the group and
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Dselfishness and they encouraged voluntary cooperation, whether it be within the group or
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Eselfishness and encouraged voluntary cooperation, not only within the group but
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正确答案: E