Option 1: Oxygen : Nitrogen

This option is incorrect. Oxygen and nitrogen are not evolved in the proportion of 1:3 during the explosion of gunpowder.

Option 2: Nitrogen : Oxygen

This option is incorrect. Nitrogen and oxygen are not evolved in the proportion of 1:3 during the explosion of gunpowder.

Option 3: Nitrogen : Carbon dioxide

This option is correct. During the explosion of gunpowder, nitrogen and carbon dioxide gases are evolved in the proportion of 1:3. This means that for every 1 molecule of nitrogen gas, 3 molecules of carbon dioxide gas are produced.

Option 4: Carbon dioxide : Nitrogen

This option is incorrect. While both carbon dioxide and nitrogen gases are involved in the explosion of gunpowder, they are not evolved in the proportion of 1:3.

Therefore, the correct answer is option 3.