Correct Option: D

Composition of air Nitrogen : 78.08 percent
Oxygen : 20.94 percent
Argon : 0.93 percent
Carbondioxdide : 0.03 percent
Neon : 0.0018 percent
Helium : 0.0005 percent
Ozone : 0.00006 percent
Hydrogen : 0.00005 percent