Which is more correct B or C

Solution:

The correct option is (C).
During the joint diastole stage, blood enters the respective auricles through veins. Blood is filled into the right and the left atria, as a result of this filling, the atrioventricular valves open allowing free blood flow from the atria into the ventricles. Hence there is a 2/3rd filling of ventricles.
 

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