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. Coarctation of the aorta is a defect that causes obstruction of blood flow from the left ventricle, leading to decreased systemic perfusion, not increased pulmonary blood flow. B. Tetralogy of Fallot is a cyanotic heart defect with decreased pulmonary blood flow due to pulmonary stenosis. C. Patent ductus arteriosus (PDA) allows blood to flow from the high-pressure aorta into the pulmonary artery, increasing pulmonary blood flow and potentially leading to pulmonary congestion and heart failure if untreated. D. Tricuspid atresia results in decreased pulmonary blood flow because the tricuspid valve is absent, preventing normal right ventricular blood flow to the lungs.