A nurse is collecting data from a client who is having an acute asthma exacerbation. When auscultating the client's chest, the nurse should expect to hear which of the following sounds?

A. Rales (crackles) are high-pitched, discontinuous sounds typically associated with fluid in the alveoli, as seen in pneumonia, pulmonary edema, or heart failure, not asthma. B. Wheezing, especially on expiration, is characteristic of asthma exacerbations. It occurs due to bronchial constriction, airway inflammation, and mucus buildup, which narrow the airways and produce a high-pitched musical sound during airflow. This is a hallmark auscultation finding in acute asthma. C. Rhonchi are low-pitched, continuous sounds often caused by mucus or secretions in larger airways, seen in conditions like chronic bronchitis or pneumonia, rather than the diffuse bronchospasm of asthma. D. A pleural friction rub is a coarse, grating sound resulting from inflamed pleural surfaces rubbing together, commonly associated with pleuritis or pulmonary embolism, not asthma.