A cyanotic newborn presents with severe respiratory distress and tachycardia (HR 165/min). Chest X-ray demonstrates cardiomegaly with increased pulmonary vascular markings. Echocardiography confirms persistent truncus arteriosus with a single arterial trunk arising from the heart. Arterial blood gas shows hypoxemia (SpO2 78%) and metabolic acidosis. The infant has no dysmorphic features or cleft palate. Which of the following embryologic defects is this patient most likely to have?

1. A)Dextrocardia
2. B)Membranous ventricular septal defectGABARITO
3. C)Transposition of the great arteries
4. D)Secundum-type atrial septal defect
5. E)Tetralogy of Fallot