Why Is It Important That Blood Pressure Be Low in the Capillary

Why is it important that blood pressure be low in the capillary beds?

A) Capillaries are thin and fragile, and there needs to be time for diffusion to occur so the blood can't move too fast.
B) There are so many capillaries, if the blood were moving too fast, it would move right past many of them.
C) It takes a little while for hemoglobin to "let go" of the oxygen, so the blood can't be moving too fast.
D) The venules and veins past the capillaries cannot handle too much pressure.
E) Capillaries cannot hold much blood, so it has to be going slowly to "fit" into the narrow tubes.