A nurse is collecting data from a client who is postoperative and recelving IV morphine 1 mg every 10 min via PCA. For which of the following manifestations should the nurse withhold the morphine?
A. The client is drowsy and responds to verbal stimuli by answering questions.
B. The client's respiratory rate is 9/min.
C. The client reports a pain fevel of 4 on a scale of 0 to 10.
D. The client's urinary catheter output was 30 mL during the past hour.