The answer is B I think. Unless answer D is supposed to say Harvey’s frontal cortex is less mature than Steven’s.
Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.
Anatomical root i think that what it is
