A nurse is assisting with the care of a client who has multiple injuries following a motor vehicle crash. The nurse should monitor for which of the following manifestations of a pneumothorax?

A. Inspiratory stridor: Inspiratory stridor is a high-pitched sound caused by upper airway obstruction, such as in croup or airway swelling. It is not associated with a pneumothorax, which affects the pleural space rather than the upper airway. B. Expiratory wheeze: Expiratory wheezing is caused by narrowing of the lower airways, such as in asthma or bronchospasm. A pneumothorax does not typically produce wheezing but instead results in impaired lung expansion. C. Coarse crackles: Coarse crackles are discontinuous, bubbling sounds caused by fluid in the alveoli, commonly seen in pneumonia or pulmonary edema. They are not characteristic of a pneumothorax, which involves air in the pleural space. D. Absence of breath sounds: A hallmark manifestation of a pneumothorax is the absence or significant reduction of breath sounds on the affected side. Air in the pleural space prevents normal lung expansion, leading to diminished or absent auscultatory findings.