Which of the following is an advantage of having pregroup meetings with potential members of a treatment group?​

A) ​The group leader can maintain cultural diversity within the group.
B) ​The group leader can ensure that he or she is not blamed if the intervention fails.
C) ​It helps establish a rapport between the group leader and the potential members.
D) ​It ensures the success of the intervention approach.

Pregroup meetings allow the group leader to establish a rapport with potential members, which can increase their comfort level and trust in the leader. This can help facilitate the success of the intervention approach. Option A is not necessarily an advantage of pregroup meetings but rather a goal of group formation. Option B is not a valid advantage of pregroup meetings as it is not the responsibility of the group leader to ensure success or be blamed for failure. Option D is too absolute and cannot be guaranteed by pregroup meetings.