A) The tunica external of the aorta is nearly absent compared to other vessels.
B) Smooth muscle is relatively thin in the aorta to increase lumen size and systemic blood flow.
C) The aorta's tunica media is thick with dense regular connective tissue to withstand the blood's pressure.
D) Elastic fibers are extensive in the tunica media of the aorta and dampen the pulse pressure generated by the heart.