When Auscultating the Anterior Thorax of a Pregnant Woman,the Nurse

When auscultating the anterior thorax of a pregnant woman,the nurse notes the presence of a murmur over the second,third,and fourth intercostal spaces.It is continuous but can be obliterated by pressure with the stethoscope or finger on the thorax just lateral to the murmur.The nurse knows that this is:

A) the murmur of aortic stenosis.
B) most likely a mammary souffle.
C) associated with aortic insufficiency.
D) indication of a patent ductus arteriosis.