If Psychotherapy and Biological Therapy for a Given Mental Disorder

If psychotherapy and biological therapy for a given mental disorder are found to be equally effective and only one therapy can be used:

A) psychotherapy should be used because it has no side effects and has longer-lasting effects
B) biological therapy should be used because it has longer-lasting effects
C) choice of therapies should be left up to the patient, not the physician or psychiatrist
D) alternative therapies should be investigated