The nurse is evaluating the effectiveness of the incentive spirometer implemented in the client's plan of care. Which outcome statement best describes the effectiveness of the incentive spirometer?

Rationale: A. Client exhibits a frequent productive cough: While coughing can help clear secretions, it does not directly indicate improved lung expansion or prevention of atelectasis, which is the primary goal of incentive spirometry. B. Client demonstrates proper use of an incentive spirometer: Proper technique is important for effectiveness, but demonstration alone does not confirm that the intervention has improved pulmonary function or prevented complications. C. Client's breath sounds are clear to auscultation bilaterally: Clear breath sounds indicate that the incentive spirometer has helped maintain lung expansion, improve ventilation, and prevent atelectasis or pulmonary congestion, reflecting the desired clinical outcome. D. Client reports using the incentive spirometer every hour while awake: Consistent use is important, but self-report does not confirm that lung expansion has been achieved or that the intervention has effectively improved respiratory status.