Correct choice is (c) Fluoroscopy
To explain I would say: Fluoroscopy is a process in which a radioactive dye is injected or ingested by the patient. The dye moves along the path in the body and emits radiation. Sometimes, X – Rays may have to fall on the dye to make it emit radiations. These radiations are collected to form images thus a fluoroscopic setup is often found together with an X-Ray setup.