Which of the following is true of exercise

a. virtually no benefits are obtained unless one gets aerobic exercise, for at least
20 minutes, three times per week
b. virtually no benefits are obtained unless one gets aerobic exercise, for at least
30 minutes, three times per week
c. moderate, minimally-structured physical activity is nearly as effective in
promoting health as other, more regimented programs
d. following an exercise program of some sort is necessary for mental, but not
physical, health
e. following an exercise program contributes to physical health but has no
impact on mental or emotional status

c