A nurse is collecting data from an infant. Which of the following is a clinical manifestation of pyloric stenosis?

A. Golf ball-size mass over the left quadrant: The mass associated with pyloric stenosis is in the right upper quadrant, not the left. B. Increased sodium level: Electrolyte imbalances in pyloric stenosis typically involve hypochloremia and metabolic alkalosis, not increased sodium. C. Absent bowel sounds: Bowel sounds are usually present unless there is severe dehydration or ileus. D. Projectile vomiting after feedings: Projectile vomiting is a classic symptom of pyloric stenosis due to obstruction.