Blood Flow in the Capillaries Is

Blood flow in the capillaries is

A) slower because there are more capillaries and they represent more flow volume.
B) faster because they are smaller and blood must speed up to get through.
C) the same speed as in the arteries and veins since they are the input and output points.
D) highly variable due to different tissues,but must average the same as speeds in arteries and the veins.
E) slower than in other blood vessels because of the presence of valves.