Which one of the following chemicals is a food preservative ?

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Q: 41 (IES/2014)

Which one of the following chemicals is a food preservative ?
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question_subject: 

Science

question_exam: 

IES

stats: 

0,75,69,19,35,75,15

keywords: 

{'food preservative': [0, 0, 0, 1], 'chemicals': [0, 0, 1, 1], 'sodium bicarbonate': [0, 0, 2, 1], 'sodium carbonate': [0, 0, 0, 1], 'sodium benzoate': [1, 0, 0, 2], 'sodium thiosulphate': [0, 1, 1, 2]}