During the Cardiac Auscultation, the Nurse Hears a Sound Immediately

During the cardiac auscultation, the nurse hears a sound immediately occurring after S₂ at the second left intercostal space.To further assess this sound, what should the nurse do?

A) Have the patient turn to the left side while the nurse listens with the bell of the stethoscope.
B) Ask the patient to hold his or her breath while the nurse listens again.
C) No further assessment is needed because the nurse knows this sound is S3.
D) Watch the patient's respirations while listening for the effect of breathing on the sound.