The Findings of the Study by Lewinsohn and His Colleagues

The findings of the study by Lewinsohn and his colleagues on the cognitive-behavioral treatment of depressed adolescents suggest that

A) treatment is effective only if parents are included.
B) treatment is effective only if parents are excluded.
C) post-treatment, only about 55 percent of treated youngsters, but 95 percent of control youngsters still met diagnostic criteria for depression.
D) treatment gains are not maintained at two years following treatment.