A nurse is caring for a 6-week-old infant who has a pyloric stenosis. Which of the following clinical manifestations should the nurse expect?

A. Distended neck veins are not associated with pyloric stenosis. B. A ridged abdomen is not typical of pyloric stenosis; rather, an olive-shaped mass may be palpated in the right upper quadrant. C. Projectile vomiting is a hallmark sign of pyloric stenosis due to the obstruction at the pylorus, preventing food from passing into the small intestine. D. Red currant jelly stools are associated with intussusception, not pyloric stenosis.