Which of the following interventions is most important for a nurse to implement in the care plan of a patient with Chronic Obstructive Pulmonary Disease (COPD) to promote effective breathing?

Rationale: A. Avoiding all physical activity is not recommended. Moderate activity, with rest periods, can improve endurance and lung function in COPD patients. Complete inactivity worsens deconditioning. B. A high-carbohydrate diet is not appropriate because it increases CO₂ production during metabolism, which can worsen respiratory acidosis. A diet higher in fat and protein is generally preferred. C. Pursed-lip breathing exercises are essential for COPD patients. They help prevent airway collapse, improve ventilation, promote CO₂ elimination, and reduce dyspnea. D. Restricting fluids is not typically indicated for COPD patients unless another condition (e.g., heart failure) requires it. Adequate hydration is necessary to thin secretions and aid airway clearance.