The Atrioventricular (AV)node Delays the Conduction Impulse from the Atria

The atrioventricular (AV) node delays the conduction impulse from the atria (0.8-1.2 seconds) for what reasons?

A) To limit the amount of blood that fills the ventricle from the atria
B) To provide time for the ventricles to fill during diastole
C) To limit the number of signals the ventricles receive in some rhythms
D) To allow the atria to rest between signals