In a Study by McCann and Holmes, Mildly Depressed Female

In a study by McCann and Holmes, mildly depressed female college students were assigned to one of three treatment conditions.One group engaged in a regular program of aerobic exercise, one group learned relaxation techniques, and the third group received no treatment.After 10 weeks, McCann and Holmes found that:

A) the group who learned relaxation techniques showed the largest improvement in mood
B) overall mood was the same in both the aerobic group and the relaxation group
C) the group who engaged in aerobic exercise showed the largest improvement in mood
D) both the aerobic exercise group and the relaxation group showed the same level of mood improvement