If Blood Transports Hormones Throughout the Body, How Do They

If blood transports hormones throughout the body, how do they communicate with specific targets?

A) Axonal pathfinding mediates the delivery of hormones to their specific targets.
B) Special gateway valves in the blood vessels direct hormones to their target tissues.
C) Special carrier proteins "walk" along microtubule tracts to deliver the hormones to their targets.
D) Only target tissues have receptors that allow them to receive the signal.