[单选题]
If you exert a force F on a/zh(vmd c .o:sv;f u.bn object, the force which the object exer5dw/i dw*n+h 6nls 9wmts on you winhd6lm*i w5+9ws/w n dll
A. depend on whether or not the object is moving.
B. depend on whether or not you are moving.
C. depend on the relative masses of you and the object.
D. always be F.
