From an evolutionary perspective, groups a. are more productive when they have two or three members as opposed to when they are larger.  b. help fulfill a basic human need to affiliate and belong with...

From an evolutionary perspective, groups

a. are more productive when they have two or three members as opposed to when they are larger.

 b. help fulfill a basic human need to affiliate and belong with others.

c. often lead to immoral behavior, such as that observed among abusive prison guards.

 d. are better able than individuals to avoid the influence of social norms.