Which of the following is an example of moving properly for calf raises?


A : Raising the heels, leaning slightly forward with knees and hips flexed


B : Lowering the heels, leaning slightly forward with feet approximately shoulder width apart


C : Raising and lowering the heels, leaning slightly backward with feet approximately shoulder width apart


D : Raising and lowering the heels, leaning slightly forward with feet approximately shoulder width apart