If gravity always exerts a force (mg) on your body, why are you not sucked to the center of the Earth?

A.     Gravity does not apply to small bodies. Only large ones.

B.     Newtons law are a crude approximation and therefore you cannot use them to understand physics of this situation

C.     Because gravity is mutually attractive, you body pulls the earth the same amount as earth pulls you. Resulting in zero net force and no acceleration

D.     There is a force acting on you due to the surface beneath you that is equal and opposite to the force of gravity, resulting in a net force of zero.