You are answering a USMLE-style medical question. Question: A 3-month-old infant is brought to her pediatrician because she coughs and seems to have difficulty breathing while feeding. In addition, she seems to have less energy compared to other babies and appears listless throughout the day. She was born by cesarean section to a G1P1 woman with no prior medical history and had a normal APGAR score at birth. Her parents say that she has never been observed to turn blue. Physical exam reveals a high-pitched holosystolic murmur that is best heard at the lower left sternal border. The most likely cause of this patient's symptoms is associated with which of the following abnormalities? Options: A) 22q11 deletion B) Deletion of genes on chromosome 7 C) Lithium exposure in utero D) Maternal alcohol consumption Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.