A nurse is caring for a client whose serum potassium level is 5.3 mEq/L (3.5-5 mEq/L). The nurse should anticipate a prescription for which of the following medications?

A. Sodium polystyrene sulfonate is a cation-exchange resin used to treat mild hyperkalemia by binding potassium in the intestines and promoting its excretion in the stool, helping to lower serum potassium levels. B. Acetylcysteine is used as a mucolytic or antidote for acetaminophen overdose and has no effect on potassium levels. C. Potassium iodide is used for thyroid protection and certain thyroid disorders, not for managing potassium imbalances. D. Potassium chloride is used to treat hypokalemia, so administering it to a client with a potassium of 5.3 mEq/L would worsen hyperkalemia.