When Taking a Person's Blood Pressure,after Proper Inflation of the Cuff,the

When taking a person's blood pressure,after proper inflation of the cuff,the first pulse sound that is heard through the stethoscope indicates that blood is flowing through the artery past the cuff.The reading on the pressure gauge at this point indicates

A) that the heart is once again beating.
B) the force of contraction of the atria.
C) diastolic pressure.
D) venous pressure.
E) systolic pressure.