Which of the Following Features of the Mammalian Circulatory System

Which of the following features of the mammalian circulatory system helps to prevent damage to capillaries from high arterial blood pressure?

A) Blood flow through the capillaries is essentially frictionless, and this reduces the amount of pressure on their walls.
B) The total cross-sectional diameter of the blood vessels increases with progression from artery to arteriole to capillary, leading to a reduced blood pressure.
C) Fluid loss from the arteries is high enough that pressure drops off significantly by the time blood reaches the capillaries.
D) Capillary beds have the thickest walls of any blood vessel to resist these high pressures.