Substances used to preserve foods by lowering the pH are

Vinegar and Citric acid

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Smoke and Irradiation

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Baking powder and Soda

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Salt and Sugar

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Solution

The correct option is A Vinegar and Citric acid
Vinegar and citric acids have low pH and decrease the pH of the food while adding. At low pH bacteria are not able to grow as their optimum pH is 6.5-7. Thus, they are used as preservatives in meat, poultry, jam, jellies, pickles etc.
So, the correct answer is option A.

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