The Graph Below Can Be Used to Understand the Forces

The graph below can be used to understand the forces underlying the movement of fluid between the blood and the interstitial fluid. What is a true statement concerning these processes?

A) Edema results from reduction of fluid flow in region A.
B) Normally, the net amount of fluid flow in region A is less than the net amount of fluid flow in region B.
C) Sodium ions contribute significantly to the movement of fluid in region B.
D) In people suffering from severe liver disease or protein starvation, the fluid flow in region B is increased.
E) Fluid leaves the blood in region A and returns to the blood in region B.