Witch of the following blood vessels has the largest diameter?

A. Arteries

B. Arterioles

C. Capillaries

D. Veins

A. Arteries

This is because arteries are carrying the blood with oxygen away from the heart and to the rest of the body. Arterioles are, by definition, small arteries, and capillaries are smaller than arterioles. Veins don't have to be quite as large, because they are carrying blood back to the heart, and they don't have as much pressure in them