The nurse is caring for a client who has a tracheostomy tube and is undergoing mechanical ventilation. The nurse can help prevent tracheal dilation, a complication of tracheostomy tube placement, by（）
A. suctioning the tracheostomy tube frequently.
B. using a cuffed tracheostomy tube.
C. using the minimal air leak technique with cuff pressure less than 25 cmH2O.
D. keeping the tracheostomy tube plugged.
