Which Statement About Endotherms Is True

Which statement about endotherms is true?

A) They can lower their body temperature by producing heat metabolically.
B) They can raise their body temperature by mobilizing active mechanisms of heat loss.
C) They respond to cold by mobilizing active mechanisms for heat loss.
D) Some can use regulated hypothermia to conserve energy.
E) Endothermy likely evolved in animals where a mutation prevented leaks in ion channels, giving them a selective advantage by increasing their time of activity in the cooler night temperatures.