Which Statement About the Mammalian Heart Is False

Which statement about the mammalian heart is false?

A) The left ventricle has thicker walls than the right ventricle because it pumps a greater volume of blood.
B) The pulmonary artery carries blood from the right ventricle to the lungs, and the pulmonary veins carry blood from the lungs to the left atrium.
C) The atrioventricular valves prevent the backflow of blood into the atria when the ventricles contract.
D) Most ventricular filling is passive.
E) The pulmonary and aortic valves prevent the backflow of blood into the ventricles when the ventricles relax.