Nitrogen, oxygen, argon & carbon diaxide are? {multiple choice}?

nitrogen oxygen argon&carbon diaxide are? a.4most comon gases in the atmosphere b.CFCs c.Causes of the green..

Answer:
I would say A
spelt wrong?
The atmosphere is 78% Nitrogen, 21% Oxygen, and 1% Argon, CO2, and other trace gasses.
a is the closest answer

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