In Order to Maintain Constant Internal Conditions, an Animal

In order to maintain constant internal conditions, an animal

A) must produce more metabolic heat than it loses to its surroundings.
B) needs to take in more water than it loses to its surroundings.
C) needs to lose and gain equal amounts of heat and water but lose more solutes than it gains.
D) must gain and lose equal amounts of heat, solutes, and water.