<prompt> Atherosclerosis impedes coronary blood flow by which of the following mechanisms?Plaques obstruct the veinPlaques obstruct the arteryBlood clots form outside the vessel wallHardened vessels dilate to allow blood to flow through  <response>: Option A: Arteries, not veins, supply the coronary arteries with oxygen and other nutrients.Option C: Atherosclerosis is a direct result of plaque formation in the artery.Option D: Hardened vessels cant dilate properly and, therefore, constrict blood flow. 