Which Cardiac Chamber Has the Thinnest Wall and Why

Which cardiac chamber has the thinnest wall and why?

A) The right and left atria because they are low-pressure chambers that serve as storage units and conduits for blood
B) The right and left atria because they are not involved directly in the preload, contractility, or afterload of the heart
C) The left ventricle because the mean pressure of blood coming into this ventricle is from the lung, which has a low pressure
D) The right ventricle because it pumps blood into the pulmonary capillaries, which have a lower pressure compared with the systemic circulation