Volume percentages of the given gases are:-Argon – 0.9340 % Neon- 0.001818 % Helium – 0.000524 % Carbon dioxide –0.04 % Ascending sequence is Helium, Neon, Carbon dioxide, Argon i.e. 3-2-4-1. But, here no option satisfies this order. So, if we take descending order then we can go with 1-4-2-3. (So, the second option).