Of What Is the Normal Umbilical Cord Comprised

Of what is the normal umbilical cord comprised?

A) 1 artery carrying blood to the fetus and 1 vein carrying blood away from the fetus
B) 1 artery carrying blood to the fetus and 2 veins carrying blood away from the fetus
C) 2 arteries carrying blood away from the fetus and 1 vein carrying blood to the fetus
D) 2 arteries carrying blood to the fetus and 2 veins carrying blood away from the fetus