What is the relationship between a substance's thermal energy and its kinetic energy? (1 point)
A) As the substance's thermal energy increases, the kinetic energy of its particles decreases, and vice versa.
B) A substance's thermal energy is the same as its kinetic energy.
C) There is no relationship between a substance's thermal energy and kinetic energy.
D) As the substance's thermal energy increases, the kinetic energy of its particles increases, and vice versa.