One Question of Interest to Researchers Is Why Self-Help Groups

One question of interest to researchers is why self-help groups, such as Alcoholics Anonymous, are effective. Research suggests that:

A) self-help groups, such as Alcoholics Anonymous, help individuals recover through improving coping skills, motivation, and by providing a supportive social network.
B) people who help other people are themselves helped, a phenomenon called the "helper therapy" principle.
C) support and encouragement from others in the group are important factors.
D) All of these are true.