A Nurse Is Preparing a Patient for a Magnetic Resonance $\bold{most}$

A nurse is preparing a patient for a magnetic resonance imaging (MRI) scan. Which nursing action is $\bold{most}$ important?

A) Ensuring that the patient does not eat or drink 2 hours before the examination.
B) Administering a colon cleansing product 6 hours before the examination.
C) Obtaining an order for a pain medication before the test is performed.
D) Removing all of the patient's metallic jewelry.