When a group enters the termination phase, the group leader acts to decrease the group's sense of:​

A) ​separateness.
B) ​self-righteousness.
C) ​internal discord.
D) ​cohesion.

In the termination phase, the group is coming to an end, and the group leader's role is to decrease the group's cohesion by encouraging members to focus on their individual goals and achievements outside of the group. This helps members transition out of the group and prevents them from becoming too dependent on the group for their sense of identity and well-being. Therefore, the correct option is D, decreasing the group's cohesion.