When a Nonionic Contrast Agent Is Injected into an Artery

Multiple Choice

When a nonionic contrast agent is injected into an artery such as the carotid,visualization of the artery and its branches occurs because

A) blood in the artery chemically changes into iodine.
B) iodine in the contrast agent mixes with blood and makes the artery radiopaque.
C) the contrast medium makes the artery easier to penetrate at the optimum kVp.
D) the contrast agent changes into a radiopharmaceutical.