After a Patient Returns from a Barium Swallow Study,what Is

After a patient returns from a barium swallow study,what is the nurse's priority?

A) Encourage the patient to increase fluid intake to flush out the barium.
B) Monitor stools closely for bright red blood or mucus,which indicates trauma from the procedure.
C) Inform the patient that the bowel movements are radioactive and that the patient should be sure to flush the toilet three times.
D) Thicken all the patient's drinks to prevent aspiration.