Which one among the following nitrogen compounds has the least percentage of nitrogen by mass?

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Q: 41 (NDA-I/2012)

Which one among the following nitrogen compounds has the least percentage of nitrogen by mass?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,14,25,14,20,3,2

keywords: 

{'nitrogen compounds': [0, 0, 0, 1], 'nh4no3': [0, 0, 0, 1], 'nitrogen': [1, 1, 0, 2], 'nh4oh': [0, 0, 0, 1], 'nh3': [0, 0, 2, 5], 'least percentage': [0, 0, 1, 1], 'mass': [0, 0, 2, 3]}