Why Do Group Members Tend to Be Homogeneous

Multiple Choice

Why do group members tend to be homogeneous?

A) because many groups attract people who are similar and groups tend to operate in ways that encourage similarity in the members.
B) because many groups attract people who are similar and the membership of most groups never changes.
C) anyone who deviates from the group is immediately removed.
D) screen new members carefully to make sure they will "fit in."