The Reason Red Blood Cells Only Live About 120 Days

The reason red blood cells only live about 120 days is because red blood cells

A) lack a nucleus and therefore cannot defend themselves from pathogen attack.
B) lack a nucleus and therefore cannot repair and rebuild cell structures.
C) are attacked and eaten by white blood cells.
D) are physiologically inferior cells that are not made to last very long.
E) are destroyed by the high levels of oxygen they carry.