What Is the Main Difference Between Group Therapy and a Self-Help

What is the main difference between group therapy and a self-help group?

A) Group therapy is less expensive than a self-help group because the members have a set time and place where they meet.
B) In group therapy, a trained therapist leads the interaction; a self-help group is conducted by people who share a similar problem without the help of a professional clinician.
C) Group therapy must be conducted by a person who shares the same problem as the group members, while a self-help group is run by a therapist who has no involvement in the problem that the other group members face.
D) Self-help groups provide far more confidentiality to the group members than a group therapy situation.