Which of the Following Statements About the Cardiac Cycle Is

Which of the following statements about the cardiac cycle is true?

A) The duration of systole is greater than that of diastole.
B) During isovolumetric ventricular relaxation,blood flows from the atria into the ventricles.
C) Closure of the atrioventricular valves occurs at the onset of ventricular systole.
D) The QRS complex occurs at approximately the same time as the closure of the semilunar valves.
E) The first valves to go from closed to open after the atrial kick are the atrioventricular valves.