As a Rock Rolls Down a Hill,which of the Following

As a rock rolls down a hill,which of the following statements would best explain what is occurring?

A) Potential energy increases as heat energy increases.
B) Kinetic energy decreases as potential energy increases.
C) Kinetic energy decreases as heat energy increases.
D) Potential energy decreases as kinetic energy increases.
E) Potential energy and kinetic energy do not changE.