Which of the Following Statements Is True of Ventricular Diastole

Which of the following statements is true of ventricular diastole or filling?

A) Approximately 50% of ventricular filling is passive; the remaining 50% is caused by the atrial kick.
B) Approximately 60% of ventricular filling is passive; the remaining 40% is caused by the atrial kick.
C) Approximately 70% of ventricular filling is passive; the remaining 30% is caused by the atrial kick.
D) Approximately 80% of ventricular filling is passive; the remaining 20% is caused by the atrial kick.