Most bacteria can be killed by:

Cooking

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Refrigeration

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Freezing

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Salting

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Solution

The correct option is A Cooking
If the temperature is high enough and the cooking is reasonably prolonged, the majority of bacteria will be killed. Refrigeration of $4^{o} C$ does not kill bacteria but slows down the rate of reproduction so that food remains safe for a longer period. Freezing and salting stops bacteria from reproducing but does not kill them.

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