How does the effectiveness of psychotherapy compare to that of antidepressant drugs?

a. Psychotherapy helps a higher percentage of depressed patients.

b. Antidepressant drugs help a higher percentage of depressed patients.

c. Patients who would respond to psychotherapy do not respond to antidepressant drugs, and vice versa.

d. Psychotherapy and antidepressant drugs help about an equal percentage of patients, and mostly the same patients.