Rank the following blood vessels in order of their average pressure, from highest to lowest: artery, vein, arteriole, venule, aorta, capillary.

A. Capillary > arteriole > venule > artery > vein > aorta

B. Capillary > vein > venule > arteriole > artery > aorta

C. Aorta > arteriole > venule > artery > vein > capillary

D. Aorta > artery > arteriole > capillary > venule > vein