Which of the following statements concerning blood vessel walls is true?

A) The tunica intima is the innermost layer of a blood vessel wall.
B) The tunica media is found in all blood vessels except veins.
C) The tunica adventitia is composed of smooth muscle and endothelium.
D) Capillaries have both a tunica intima and a tunica media.
E) Vessel diameter is controlled primarily by the tunica intima.