It Has Been Theorized That the Effectiveness of the "Adult

It has been theorized that the effectiveness of the "adult children of alcoholics" group is due to the

A) size of the group, since larger groups provide more people to share feedback with the afflicted group members.
B) application of techniques once relegated to the "pop" psychology realm.
C) willingness of the group members to accept insights offered to them by others in the group.
D) placebo effect.