An object that has been realeased from rest above earths suface gains kinetic energy as it falls. Where does the kinetic energy of the object come from?

a) The kinetic energy comes from the potential energy stored in the object's position above the Earth's surface.
b) The kinetic energy comes from the gravitational force acting on the object.
c) The kinetic energy comes from the object's internal energy.
d) The kinetic energy comes from the Earth's rotation.