Which lists imaging techniques that use wave behaviors in order of increased risk of cancer from least risk to greatest?

Sonography uses sound waves, not ionizing radiation, so it has the least cancer risk of these techniques. X-ray radiography uses ionizing X-rays, and CT scans use X-rays to create many images, typically involving a greater radiation dose. Thus the order from least risk to greatest is sonography, X-ray radiography, CT scan: choice A.

AI-written and checked against the verified answer.