To warm up before a run, David begins by completing quad and hurdler's stretches. Choose the answer that accurately evaluates his choice of warm-up activities.

AThese activities are appropriate because they prepare muscles for intense movement.

BThese activities are not appropriate because the muscles stretched are not warm yet.

CThese activities are appropriate because they make the leg muscles more flexible.

DThese activities are not appropriate because they stretch muscles not used in the exercise.