How Can Blood Circulation Cool You Off

How can blood circulation cool you off?

A) Blood warms up in areas of high metabolic activity and warm blood is directed toward external surfaces where heat can be transferred to the cooler environment.
B) Blood warmed up at the surface of the skin loses heat as it travels in toward the core of the body.
C) Blood circulation can be speeded up by increasing the heart rate in order to dissipate heat more quickly.
D) Blood circulation can be slowed down by slowing down the heart rate, using less energy, thereby reducing heat production.
E) Blood circulation can only serve to warm you up.