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.
-
Aselfishness, and voluntary cooperation was encouraged as well, whether it be within the group or
分析该选项
-
Bselfishness, encouraging voluntary cooperation as well, both within the group but
分析该选项
-
Cselfishness and also encouraging voluntary cooperation, within the group and
分析该选项
-
Dselfishness and they encouraged voluntary cooperation, whether it be within the group or
分析该选项
-
Eselfishness and encouraged voluntary cooperation, not only within the group but
分析该选项