The Left Ventricle in Mammals Is More Muscular Than the Right

The left ventricle in mammals is more muscular than the right ventricle because

A) the left ventricle is always contracting to maintain a systemic blood pressure.
B) the left ventricle has to pump blood throughout the body at high pressure.
C) the right ventricle only pumps blood into the right atrium.
D) the left ventricle pumps blood with a higher hematocrit than the blood that leaves the right ventricle.
E) the left ventricle pumps more total blood than the right ventricle.