Which Statement About the Blood-Brain Barrier Is True

Which statement about the blood-brain barrier is true?

A) It is a part of the immune system that involves the release of antibodies to protect the brain from infectious agents.
B) It is a property of the closely packed endothelial cells of the walls of brain capillaries that prevents large molecules from entering the brain.
C) It is a property of the blood vessels of the brain that promotes the diffusion of nutrients into the tissue of the brain.
D) It is a property of neurons that prevents them from accidentally releasing their neurotransmitters into the blood circulation.