Which Statement Is True Regarding Moment Arm

Which statement is true regarding moment arm?

A) Moment arm is largest when the angle of pull on a bone is 90°.
B) Changes in moment arm directly affect joint muscle torque.
C) For torque to remain constant,more force must be produced when moment arm decreases.
D) Both moment arm is largest when the angle of pull on a bone is 90° and changes in moment arm directly affect joint muscle torque.
E) All of these answers are correct.