The Primary Finding of Hans Eysenck's 1952 Review of Psychotherapy

The primary finding of Hans Eysenck's 1952 review of psychotherapy outcome studies was that ______.

A) psychotherapy was of little benefit, since most clients got better without it
B) psychotherapy was beneficial when practiced by therapists with doctoral degrees, but not beneficial when practiced by therapists with master's or bachelor's degrees
C) humanistic psychotherapy was significantly more effective than psychodynamic psychotherapy
D) cognitive psychotherapy was significantly more effective than behavioral psychotherapy