How Does the Metabolic Rate Affect an Animal's Core Temperature

How does the metabolic rate affect an animal's core temperature?

A) As the metabolic rate increases, so does the animal's core temperature.
B) As the metabolic rate increases, the animal's core temperature decreases.
C) The metabolic rate affects only the external temperature of an animal and doesn't affect the core temperature.
D) The metabolic rate doesn't affect either the core or external temperature of an animal.