During palpation of the anterior chest wall, the nurse notices a coarse, crackling sensation over the skin surface. On the basis of these findings, the nurse suspects:

A. This is a vibration felt on the chest wall when a patient speaks, often used to assess lung sounds. It is not associated with the crackling sensation described here. B. The coarse, crackling sensation felt on the skin surface when palpating is crepitus, which occurs when air escapes into the subcutaneous tissue, often due to trauma, infection, or the presence of a pneumothorax. C. These are abnormal lung sounds, such as crackles, wheezes, or rhonchi, heard with a stethoscope during auscultation, not felt on the chest wall during palpation. D. A friction rub is a grating or scraping sound heard with a stethoscope, typically due to inflammation of the pleural surfaces. It is not a sensation felt on the chest wall.