This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
A 3-month-old infant is brought to the physician because of difficulty feeding, failure to 
thrive, and episodes of bluish pale skin during crying or feeding, Physical examination reveals 
a harsh systolic ejection murmur that is heard over the pulmonic area and left sternal border, 
A chest radiograph at shows a boot-shaped heart, 

Which of the following events will most likely explain the embryologic mechanism responsible for the development of this condition? 
Select and explain. 
A. Anterosuperior displacement of the infundibular septum, B. Failure of aorticopulmonary septum to divide, C. Failure of aorticopulmonary septum to spiral, D. Incomplete absorption of the sinus venosus into the right atrium
A: Anterosuperior displacement of the infundibular septum
Answer: A: Anterosuperior displacement of the infundibular septum 
Explanation: None