You are answering a USMLE-style medical question. Question: Thirty minutes after delivery, a 3600-g (7-lb 15-oz) newborn has noisy breathing, bluish discoloration of her lips, and intermittent respiratory distress. She was born at 38 weeks' gestation and required bag-mask resuscitation immediately after delivery. Pregnancy was uncomplicated. Her mother has noticed the bluish lip discoloration worsen when she fed and improve when she cried. The patient's pulse is 163/min, respirations are 62/min, and blood pressure is 60/30 mm Hg. The crying infant's lungs are clear to auscultation. Further evaluation of this patient is most likely to show which of the following? Options: A) Diffuse reticulogranular densities on chest x-ray B) Boot-shaped heart on chest x-ray C) Passage of a gastric catheter through the mouth not possible D) Passage of a catheter through the nasal cavity not possible Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.