Four 1 litre flasks are separately filled with hydrogen, helium, oxygen and ozone gases at the same temperature and pressure. The ratio of total number of atoms of these gases present in the different flasks would be
1:1:1:1
1:2:2:3
2:1:2:3
3:2:2:1
1:1:1:1
1:2:2:3
2:1:2:3
3:2:2:1