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?

A. Clear breath sounds indicate effective ventilation and oxygenation, which are the desired outcomes of incentive spirometry. This outcome directly reflects the effectiveness of the incentive spirometer in preventing atelectasis and improving lung expansion. B. A productive cough suggests mobilization of secretions. While this is important for airway clearance, it is not a direct measure of the effectiveness of the incentive spirometer. This outcome is related to airway clearance, but not specifically to the incentive spirometer's role in lung expansion. C. This outcome measures the client's ability to use the device correctly but does not assess the effectiveness of the device in improving lung function. This outcome is important but does not directly address the goal of the incentive spirometer. D. This outcome measures compliance with the therapy but does not assess its effectiveness in improving lung function. This outcome is important for adherence but does not directly address the goal of the incentive spirometer.