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 

▼

想近距离感受王文静老师的风采

趁着暑假搞定GMAT

那就快来博智的暑期封闭班吧！