Which Statement Most Accurately Describes the Relationship Between Aerobic Exercise

Which statement most accurately describes the relationship between aerobic exercise and stress?

A) There is a positive correlation, but not a causal relationship, between aerobic exercise and stress.
B) There is a negative correlation, but not a causal relationship, between aerobic exercise and stress.
C) Exercise is one factor that causes reductions in stress.
D) It is not known if exercise is related to stress reduction due to the third-variable problem.