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Well, i think the answer would be : B. Hydrogen

There were no complex organisms in early earth, so Oxygen and nitrogen is really unlikely to be exist

argon is produced as an industrial effect, so this is not the answer either

hope this helps

taskmasters

My guess among the choices listed above would be that of option B. Hydrogen would be the gas that was most likely to be present in the Earth's earliest atmosphere. This is because oxygen, nitrogen and argon was not yet known to be present during that time.

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