A
Diastole, atrial systole, ventricular diastole, ventricular systole.
B
Atrial systole, ventricular systole, atrial diastole, ventricular diastole.
C
ventricular systole, ventricular diastole, diastole, atrial systole.
D
Ventricular diastole,diastole, ventricular systole, atrial systole.
Correct option is B)