In One Massive Experiment,potentially Delinquent Boys Were Assigned to a 5-Year

In one massive experiment,potentially delinquent boys were assigned to a 5-year treatment program that included professional counseling and family assistance.Many years later,Joan McCord's investigation of this program's effectiveness revealed that

A) clients who received the special treatment subsequently had fewer incidents of juvenile delinquency.
B) clients typically underestimated the truly positive effects of this program on their own lives.
C) only the therapists who were involved in the program could accurately gauge its effectiveness.
D) clients' accounts of the program's effectiveness were often misleading and overly positive.