Which one of the following is the chemical formula of Washing Soda ?

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Q: 17 (NDA-I/2018)

Which one of the following is the chemical formula of Washing Soda ?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,17,8,3,17,2,3

keywords: 

{'chemical formula': [0, 0, 1, 3], 'washing soda': [0, 0, 0, 1], 'na2c03': [0, 0, 0, 2], 'nahc03': [0, 0, 0, 1], 'naoh': [0, 0, 1, 9]}