Which of the Following Reflects the State of Psychotherapy Research

Which of the following reflects the state of psychotherapy research of Adlerian therapy?

A) Additional research to evaluate Adlerian therapy is unnecessary because the overall process of this treatment is effective and because paradoxical interventions, which are often used by Adlerian therapists, are highly effective.
B) Meta-analytic evidence suggests that Adlerian therapy may be more effective than placebo, but the studies were small in number and dated (i.e., they were conducted more than 20 years ago) .
C) Because Adlerian therapy cannot be adapted to a brief therapy format, it is unlikely that future research will evaluate this outdated form of treatment.
D) None of the above.
E) Only b and c.