A 2006 Meta-Analysis by Pettigrew and Tropp on the Impact

A 2006 meta-analysis by Pettigrew and Tropp on the impact of contact and stereotype change showed that:

A) Contact that is forced reduces prejudice less than contact that is voluntary.
B) Contact is not a very useful way to change people's stereotypes.
C) The relation between contact and stereotype change is explained by the fact that low-prejudice people tend to live closer to people from other groups.
D) People who experience greater intergroup contact are less prejudiced.