An older adult client receives a dose of hydromorphone 4 mg and hydroxyzine 25 mg IM one hour after returning from the postanesthesia care unit (PACU). Which assessment finding should prompt the practical nurse (PN) to administer a PRN dose of naloxone?

B Reports of shortness of breath. A Pulse oximetry 88%. C Wheezing upon auscultation. D Respiratory rate of 8 breaths/minute.