Which of the Following Is True of MRI Imaging

Which of the following is true of MRI imaging?

A) It is based on the property that certain isotopes, when injected into the body, emit positrons that can be detected in the body.
B) Diseased and damaged tissues often yield the same image as healthy tissues.
C) Cells exposed to radiations from MRIs often develop harmful mutations.
D) It is based on the absorption of energy when certain nuclei are excited by a strong magnetic field.
E) It involves ingesting a radioactive isotope and measuring the radiation intensity emitted by different regions in the body.