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(B) The early atmosphere of the Earth was reducing in nature and contained gases like methane $(CH_4)$,ammonia $(NH_3)$,and hydrogen $(H_2)$.As the Ea

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Oxygen

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(B) The early atmosphere of the Earth was reducing in nature and contained gases like methane $(CH_4)$,ammonia $(NH_3)$,and hydrogen $(H_2)$.As the Earth cooled,water vapor condensed to form oceans. Solar radiation ($UV$ rays) split water molecules into hydrogen and oxygen $(2H_2O \xrightarrow{UV} 2H_2 + O_2)$.The light hydrogen gas escaped into space,while the released oxygen reacted with methane and ammonia to form carbon dioxide $(CO_2)$ and other oxygen-containing compounds.Thus,the reducing atmosphere was gradually replaced by an oxidizing atmosphere rich in oxygen.

The early atmosphere contained methane and other hydrocarbons. They have now been replaced by:

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