To Prevent Respiratory Complications Resulting from Immobility,the Best Nursing Interventions

To prevent respiratory complications resulting from immobility,the best nursing interventions would be to:

A) Suction every 4 to 6 hours.
B) Administer pain medications as frequently as possible.
C) Teach the patient the technique of pursed lip breathing.
D) Reposition the patient, and encourage him or her to cough and deep-breathe at least every 2 hours.