The Mother of a Premature Newborn Is Crying and Tells

The mother of a premature newborn is crying and tells the nurse the neonatologist said the baby will need surgery to close the patent ductus arteriosus.She asks what this is.Which is the best explanation?

A) It is an opening in the blood vessel that shunts blood away from the liver and needs to close after birth.
B) It is an opening in the aorta that shunts blood away from the lungs,which is normal in the fetus but needs to close after birth.
C) It is a small hole in the atria of the heart that shunts blood from the right atrium to the left atrium,reducing blood flow to the lungs.
D) It is a small hole in the atria of the heart that shunts blood from the left atrium to the right atrium,reducing blood flow to the lungs.