You instantly suspect that this pathology may be due to?

You are assisting the cardiac surgeon with an open-heart surgery case in a 65-year old female. She had triple vessel coronary artery disease. She has been having chest pain and dyspnea; the workup revealed that she had coronary artery disease. After placing the patient on bypass, the surgeon has a difficult time cooling down the heart and decides to open the right atrium to determine the cause. As soon as the chamber is opened, you note the presence of blood gushing out of the structure -labeled with the arrow. You instantly suspect that this pathology may be due to?

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A. Ostium secundum atrial septal defect
B. Failure of obliteration of the left common cardinal vein
C. Failure of the 5th aortic arch to regress
D. Total anomalous venous return