Which of the Following Most Accurately Summarizes the Results of Outcome

Which of the following most accurately summarizes the results of outcome research on different forms of psychotherapy?

A) Despite decades of research there is little evidence that psychotherapy is effective.
B) Psychotherapy is effective, and many types of psychotherapy share key 'active ingredients.'
C) Psychoanalytic treatment tends to be superior to other treatments because it is the only one that seeks to uncover underlying causes of disorders.
D) Various forms of psychotherapy are so radically different that it is not possible to offer definitive conclusions concerning their effectiveness.