The nurse is administering sevelamer during lunch to a client with chronic kidney disease (CKD). The client asks the nurse to bring the medication later. The nurse should describe which action of sevelamer as an explanation for taking it with meals?

A. Prevents indigestion associated with ingestion of spicy foods: Sevelamer is not an antacid or gastrointestinal comfort medication, so it does not address indigestion caused by spicy foods. Its primary purpose is to control phosphate levels in clients with CKD. B. Binds with phosphorus in foods and prevents absorption: Sevelamer is a phosphate binder that attaches to dietary phosphorus in the gastrointestinal tract, preventing its absorption into the bloodstream. This action helps control hyperphosphatemia in CKD when taken with meals, as phosphorus is consumed during eating. C. Buffers hydrochloric acid and prevents gastric erosion: Unlike antacids or proton pump inhibitors, sevelamer does not neutralize stomach acid or protect the gastric lining. Its function is specific to phosphorus binding rather than acid buffering. D. Promotes stomach emptying and prevents gastric reflux: Sevelamer has no prokinetic properties and does not prevent reflux. Its use is unrelated to gastric motility or lower esophageal sphincter function.