A client with chronic obstructive pulmonary disease (COPD) is experiencing worsening dyspnea and low oxygen levels. The vital signs are assessed as a temperature of 99.6° F (37.5° C), heart rate 98 beats/minute, respirations 28 breaths/minute, blood pressure 140/82 mm Hg, and a oxygen saturation 88% on room air. Which action should the nurse implement?

A. Apply a nonrebreather mask at 100% oxygen: Providing 100% oxygen may risk suppressing the client's respiratory drive in COPD, where careful oxygen titration is necessary to avoid worsening hypercapnia. B. Prepare client for endotracheal intubation: Although intubation is necessary in severe respiratory failure, the client’s vital signs do not currently indicate a need for immediate intubation and invasive airway management. C. Place the client in a forward-leaning position: Leaning forward (tripod position) helps optimize lung expansion, reduce work of breathing, and improve oxygenation, making it an appropriate and immediate non-invasive intervention. D. Obtain a sputum sample for culture and sensitivity: Identifying infection may be important later, but immediate priority is to reduce dyspnea and support oxygenation to stabilize the client’s respiratory status.