Researchers Investigating the Effect of Aerobic Exercise on Psychological Functioning

Researchers investigating the effect of aerobic exercise on psychological functioning conclude that

A) exercise appears to have a modest effect on mood and well-being immediately after a workout.
B) whereas immediate improvements in mood and well-being are associated with aerobic exercise, long-term participation in an exercise program has an even stronger effect on mood and mental health.
C) the positive effect of exercise on mood is unrelated to increased self-efficacy.
D) whereas exercise is associated with improved mood, it has no effect on personality variables such as the self-concept and self-esteem.