The Main Contribution of Research Using the Minimal Group Paradigm

The main contribution of research using the minimal group paradigm is the finding that

A) only people who strongly identify with a particular ingroup are likely to discriminate against the outgroup.
B) random assignment of people to groups fails to lead to ingroup favoritism.
C) a history of antagonism and competition makes people more likely to discriminate against an outgroup.
D) None of these.