The correct option is A (i) Nitrogen (ii) oxygen (iii) carbon dioxide (iv) argon (v) water vapour
The atmosphere is a mixture of gases with 78% nitrogen, 21% oxygen, 0.03% carbon dioxide, 0.93% argon and small amounts of other gases. Air also contains variable amounts of water vapour, on an average around 1% at sea level and 0.4% over the entire atmosphere.