A client with chronic obstructive pulmonary disease (COPD) receives a prescription for chest physiotherapy (CPT) to help mobilize secretions. Following the therapy, which finding indicates to the nurse that the intervention was effective?

A. An increase in breath sounds may suggest improved airflow, but it does not necessarily indicate effective mobilization of secretions. B. Absence of fine crackles indicates that there are no longer small airway secretions or fluid in the lungs, suggesting that the chest physiotherapy was effective in mobilizing secretions. C. While the absence of coarse crackles is also a positive finding, fine crackles specifically indicate fluid or secretions in the small airways, making their absence a more direct indicator of the effectiveness of chest physiotherapy. D. An increase in respiratory rate may indicate respiratory distress or worsening of the condition, rather than effectiveness of the chest physiotherapy in mobilizing secretions.