Which one among the following equations is correctly balanced?

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Q: 78 (NDA-II/2012)

Which one among the following equations is correctly balanced?
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question_subject: 

General Knowledge

question_exam: 

NDA-II

stats: 

0,2,2,1,2,0,1

keywords: 

{'equations': [0, 0, 1, 1], 'h20': [0, 0, 0, 4], 'naoh': [0, 0, 1, 9], 'h2': [0, 0, 4, 4], 'naai02': [0, 0, 0, 1], 'a1': [1, 0, 0, 3]}