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.
B) psychotherapy should be used because it is easier to administer.
C) biological therapy should be used because it has longer-lasting effects.
D) biological therapy should be used because it is more cost-effective.