GMAT Sentence Correction
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Source: PREP
Level: 4
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.
- A selfishness, and voluntary cooperation was encouraged as well, whether it be within the group or
- B selfishness, encouraging voluntary cooperation as well, both within the group but
- C selfishness and also encouraging voluntary cooperation, within the group and
- D selfishness and they encouraged voluntary cooperation, whether it be within the group or
- E selfishness and encouraged voluntary cooperation, not only within the group but