A nurse is caring for a client who is 5 hr postoperative following a transurethral resection of the prostate (TURP). The nurse notes that the client's indwelling urinary catheter has not drained any urine in the past hour. Which of the following actions should the nurse take first?

A. The nurse should first assess and attempt to correct the problem before notifying the provider. B. Irrigation may be necessary if there is a clot, but the nurse must first check for a simpler cause, such as tubing obstruction. C. Changing the irrigant rate will not resolve a catheter that is not draining due to blockage or kinks. D. The first action is to assess for mechanical obstruction, such as kinks or dependent loops in the tubing, which is the most common and easily correctable cause of absent urine drainage.