Why does blood flow from the arterial side of the circulation to the venous side of the circulation?

A) Capillary pressure is higher than the pressure within the large arteries and veins.
B) The oncotic pressure in the venous side of the circulation is greater than the oncotic pressure on the venous side of the circulation.
C) The pressure on the arterial side of the circulation is higher than the pressure on the venous side of the circulation.
D) Blood volume is greater on the arterial side of the circulation than on the venous side of the circulation.