While Caring for a Patient with Respiratory Disease,the Nurse Observes

While caring for a patient with respiratory disease,the nurse observes that the patient's SpO₂ drops from 94% to 85% when the patient ambulates in the hall.What does the nurse determine from this response?

A) Supplemental oxygen should be used when the patient exercises.
B) Arterial blood gas determinations should be done to verify the SpO₂.
C) This finding is a normal response to activity,and the patient should continue to be monitored.
D) The oximetry probe should be moved from the finger to the earlobe for an accurate SpO₂ during activity.