A neonate with suspected congenital heart disease has a pre-ductal SpO2 of 98% and a post-ductal SpO2 of 82%. This differential MOST suggests:
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A
Right-to-left shunting at the level of the ductus arteriosus, as seen in coarctation of the aorta or interrupted aortic arch
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B
Left-to-right shunting causing pulmonary overcirculation
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C
Transient tachypnea of the newborn with resolving fluid
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D
Pulmonary hypertension with bidirectional ductal shunting