Why is the standing quadriceps stretch a better stretching exercise than the sitting quadriceps stretch?

By standing you allow your muscle to stretch further than if you were sitting and trying to stretch.

Why is the standing quadriceps stretch a better stretching exercise than the sitting quadriceps stretch?
A. It stretches the quadriceps muscle further.B. It can also be performed while lying down.C. It exerts less force on the knees.D. It causes sideways torque on the knees.

i would say the answer is either C or D but i would go with C