The Nurse Auscultates a Functional Systolic Murmur,grade II/IV,on a Woman

The nurse auscultates a functional systolic murmur,grade II/IV,on a woman in week 30 of her pregnancy.The remainder of her physical assessment is within normal limits.The nurse would:

A) consider this an abnormal finding and refer her for additional consultation.
B) ask the woman to run in place briefly and then assess for an increase in intensity of the murmur.
C) know that this is a normal finding resulting from the increase in blood volume during pregnancy.
D) ask the woman to restrict her activities and return to the clinic in 1 week for re-evaluation.