Use the Following Information to Answer Questions 8 and 9

Use the following information to answer Questions 8 and 9. A 50-year-old man has a body weight of 110 kg, resting heart rate of 90 beats/min, arterial pressure of 120/70 mm Hg, arterial hematocrit of 35%, and normal body temperature. His pressure-volume diagram of the left ventricle is shown below.
-When does the first heart sound occur in the ventricular pressure- relationship?

A) At point B
B) Between point A and point B
C) Between point B and point C
D) Between point C and point D
E) Between point D and point A