You Check a Patient for Pain Relief 1 Hour After

You check a patient for pain relief 1 hour after administering 15 mg of morphine intramuscularly.The patient is sleeping and has a respiratory rate of 10 breaths/min.What is your best first action?

A) Attempt to arouse the patient by calling his or her name and lightly shaking the arm.
B) Administer oxygen by mask or nasal cannula and notify the prescriber.
C) Check the patient's oxygen saturation and raise the head of the bed.
D) Document the finding as the only action.