Which of the following is not a trace gas found in our atmosphere?

A=Oxygen

B=Argon

C=Carbon Dioxide

D=Neon

D=Neon

Explanation:

Air is mostly composed of nitrogen, oxygen, argon, carbon dioxide and traces amount of water vapor, methane and helium. Nitrogen forms the bulk of air with 78%, there is 21% of oxygen, and the remaining components contribute to that 1%. Neon is a noble gas or inert gas that is not found in earth's atmosphere.

It would be Neon because most abondent gas are nitrogoen, oxygen and Argon.