In a physics problem involving an object falling freely from a height, what is the relationship between the final kinetic energy and the final gravitational potential energy just before it hits the ground?
A. The final kinetic energy is equal to the initial gravitational potential energy, and the final gravitational potential energy is zero.
B. The final kinetic energy is twice the final gravitational potential energy.
C. The final kinetic energy is zero, and the final gravitational potential energy is equal to the initial kinetic energy.
D. The final kinetic energy is zero, and the final gravitational potential energy is equal to the initial kinetic energy.