The Growth of Self-Help Groups During the 1980s and 1990s

The growth of self-help groups during the 1980s and 1990s

A) represents an increase in the number of people attending existent groups rather than a proliferation of types of groups.
B) is more effective but less socially acceptable than traditional therapy.
C) resulted in more people receiving help from these groups than from professional therapists.
D) has occurred primarily in the United States, and other countries have not shown such an increase.