A nurse is caring for a client who has pneumonia and a prescription for oxygen therapy at 5 L/min via nasal cannula. Which of the following actions should the nurse take?

Rationale: A. Securing oxygen tubing to the bed sheet is not appropriate; tubing should remain free to avoid dislodgement or kinking. B. Attaching a humidifier bottle is correct when oxygen is delivered at 4 L/min or higher to prevent drying of the mucous membranes. C. The nasal cannula should remain in place while the client eats if possible; if removed, oxygen therapy should be promptly resumed. D. Petroleum jelly should not be used near oxygen equipment due to the fire hazard; a water-soluble lubricant should be used instead if needed.