Which of the following answers is not a purpose for group communication?
a. to create a common vision or goal
b. to cause conflict and divide people
c. to talk regularly so that everyone is informed
d. to understand each person’s personality and strengths

A group communication, that is communication of people within a group, should be constructive, that is, it should bring all the participants some advantage - otherwise  the participants might decline to participate in it. So it should not b.  cause conflict and divide people - this would be counter-productive.

Rehab i’m not sure but i hope this