Which Statement Is True

Which statement is true?

A) When body temperature rises, blood flow to the skin decreases.
B) Endotherms, but not ectotherms, control blood flow to the skin.
C) When the environment is too cold, blood flow to the skin increases.
D) Blood vessels in the extremities widen in response to decreases in body temperature.
E) When body temperature rises, mammals transport heat to hairless skin surfaces.