While Caring for a Patient with Respiratory Disease, the Nurse

While caring for a patient with respiratory disease, the nurse observes that the patient's SpO₂ drops from 92% to 88% while the patient is ambulating in the hallway. Which action should the nurse take next?

A) Notify the health care provider.
B) Document the response to exercise.
C) Administer the PRN supplemental O₂.
D) Encourage the patient to pace activity.