A nurse is caring for an infant who has a congenital heart defect. Which of the following defects is associated with increased pulmonary blood flow?

A. Tetralogy of Fallot: A cyanotic defect that decreases pulmonary blood flow due to pulmonary stenosis. B. Coarctation of the aorta: Involves narrowing of the aorta, which affects systemic circulation, not pulmonary blood flow. C. Patent ductus arteriosus: Causes increased pulmonary blood flow as blood shunts from the aorta to the pulmonary artery due to the open ductus arteriosus. D. Tricuspid atresia: A cyanotic defect that decreases pulmonary blood flow by preventing blood from passing through the tricuspid valve.