The Illustration Below Diagrams Osmotic (Red Arrows) and Blood Pressures

The illustration below diagrams osmotic (red arrows) and blood pressures (green arrows) as a function of distance along a capillary. This illustration explains why:

A) diffusion of oxygen takes place in the capillaries.
B) blood flow slows down in the capillaries.
C) protein molecules do not leave the blood vessels.
D) fluid enters the capillary at the arteriole end and leaves at the venule end.
E) fluid leaves the capillary at the arteriole end and reenters at the venule end.