The sound of closure of the aortic semilunar valve is best heart with a stethoscope:
A. About 6 cm to the left of the sternum in the 5th intercostal space
B. Parasternally in the right 2nd intercostal space
C. Parasternally in the left 2nd intercostal space
D. Parasternally in the right 5th intercostal space