A client is using an incentive spirometer on the first postoperative day after an inguinal herniorrhaphy. The practical nurse (PN) should reteach the proper use of the spirometer when the client demonstrates which action?

A. Exhaling slowly after two seconds is not part of the incentive spirometer use. Proper technique involves a slow, steady inhalation, not exhalation. B. Blowing forcefully into the mouthpiece indicates incorrect use of the spirometer. The client should inhale slowly and deeply through the mouthpiece to expand the lungs and improve ventilation. C. Using a tight seal around the mouthpiece is correct and necessary to ensure that the spirometer measures the volume of air accurately. D. Sitting upright during the treatment is correct as it maximizes lung expansion and facilitates deep breathing.