A Clinical Psychologist Has Developed a New Form of Psychotherapy

A clinical psychologist has developed a new form of psychotherapy to treat a particular personality disorder. In order to test its effectiveness, a group of people with the personality disorder is selected to receive the therapy for 8 weeks. A second group of people with the disorder is also created, but this group receives no therapy at all. At the end of the 8 weeks, the mental health of people in both groups is assessed to evaluate the new psychotherapy. In this study, the people who did not receive any therapy would be in the

A) experimental group
B) control group
C) random group
D) sample group