Which action should the nurse take when providing postoperative nursing care to a child after insertion of ventriculoperitoneal (VP) shunt?

The correct action for the nurse is to monitor for an increased temperature. This is crucial because fever can indicate infection, a common complication after VP shunt insertion. Checking urine for glucose and protein (A) is not relevant to postoperative care for a VP shunt. Administering narcotics for pain control (B) is important but not the priority in this case. Testing CSF fluid leakage for protein (C) is not a routine postoperative care action. Monitoring for increased temperature (D) is essential to promptly identify and manage infection.