The Superior Vena Cava Is

The superior vena cava is:

A) a large-diameter vein that gathers blood from the lower portion of the body and returns it to the heart.
B) a large-diameter vein that gathers blood from the upper portion of the body and returns it to the heart.
C) an enlarged, dilated vein toward the surface of the skin.
D) the lower portion of each side of the heart.
E) the main artery leaving the heart and distributing oxygenated blood throughout the body.