In Tajfel's Research (In Which Subjects Are Randomly Assigned to Group

In Tajfel's research (in which subjects are randomly assigned to Group X or Group W) , subjects who are total strangers but who share the same meaningless label tend to:

A) express greater liking for and allocate more rewards to others in their own group
B) compete against members of their own group as a form of "sibling rivalry"
C) perceive greater similarity among members of their own group than among members of the other group
D) fabricate elaborate reasons to explain why they feel a sense of "belonging" to their own group