Which one of the following gases is placed second in respect of abundance in the Earths atmosphere ?

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Q: 67 (NDA-II/2017)

Which one of the following gases is placed second in respect of abundance in the Earth’s atmosphere ?
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question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,53,18,53,6,9,3

keywords: 

{'gases': [0, 0, 5, 12], 'atmosphere': [1, 1, 4, 7], 'carbon dioxide': [2, 0, 5, 6], 'oxygen': [3, 0, 1, 0], 'nitrogen': [1, 1, 0, 2], 'hydrogen': [0, 0, 1, 3], 'abundance': [2, 0, 2, 4], 'earth': [0, 1, 1, 1]}