Which of the Following Is TRUE

Which of the following is TRUE?

A) Exercise must be completed for one hour each day in order for any benefits to be seen in stress studies.
B) Individuals who exercise put themselves at risk of cardiovascular disease if they are also working under stressful conditions.
C) People who exercise on a regular basis tend to be less depressed and less stressed.
D) Exercise does not affect stress, it only improves mood.