An important feature of optimal intergroup contact that involves working together on a shared goal is known as

A) the mere exposure effect.
B) effort justification.
C) in-group favoritism.
D) task-oriented cooperation.

Task-oriented cooperation is an important feature of optimal intergroup contact because it involves members of different groups working together towards a common goal. This allows them to see each other as valuable contributors and equals, and can help break down negative stereotypes and prejudices. The other options (mere exposure effect, effort justification, in-group favoritism) are not directly related to working together on a shared goal as a feature of intergroup contact.