You are answering a USMLE-style medical question. Question: A 1900-g (4-lb 3-oz) newborn is delivered at term to a 36-year-old primigravid woman. Pregnancy was complicated by polyhydramnios. Apgar scores are 7 and 7 at 1 and 5 minutes, respectively. He is at the 2nd percentile for head circumference and 15th percentile for length. Examination shows a prominent posterior part of the head. The ears are low-set and the jaw is small and retracted. The fists are clenched, with overlapping second and third fingers. The calcaneal bones are prominent and the plantar surface of the foot shows a convex deformity. Abdominal examination shows an omphalocele. Further evaluation of this patient is most likely to show which of the following findings? Options: A) Ventricular septal defect B) Ebstein's anomaly C) Pheochromocytoma D) Holoprosencephaly Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.