The umbilical artery carries blood from the fetus to the placenta and the umbilical vein carries blood from the placenta to the fetus. Which is the correct statement regarding differences in blood composition between the umbilical artery and vein? (A) Blood in the umbilical artery contains less glucose than blood in the umbilical vein. (B) Blood in the umbilical artery contains less carbon dioxide than blood in the umbilical vein. (C) Blood in the umbilical artery contains more deoxygenated blood in the umbilical vein. (D) Blood in the umbilical artery contains less urea than blood in the umbilical vein.