To produce images of the body in order to have medical professionals examine and diagnose, patients may undergo an MRI scan, a mammogram, or an x-ray (among other procedures). MRI imaging works by A) subjecting hydrogen nuclei to fluctuating magnetic fields.

B) sending radio waves through the body.

C) injecting special radiolabeled isotopes into the body.

D) Sending low-frequency sound waves through the patient.

E) exposing the body to high levels of radiation.