Please answer experts.,...

Dear student,
Please find below the answer:

The correct option is (2) i.e. ventricular diastole.
Ventricular filling begins when mitral and tricuspid valves open after ventricular pressure falls below atrial pressure. Around 70-80% of filling is achieved by ventricular diastole while the remaining 20-30% results from atrial systole.

Hope this clears your doubt.
Regards.