One Conclusion That Can Be Drawn from the Robbers Cave

One conclusion that can be drawn from the Robbers Cave study is that

A) propaganda is not a particularly effective means of eliminating group conflict.
B) imaginary competition does not lead to group conflict.
C) the best way to reduce intergroup conflict is simply to bring group members together under noncompetitive circumstances, even if they do not get the chance to interact with each other.
D) young boys exhibit greater aggressive tendencies than young girls.