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Option 3 : 3

The error is in part 3 of the sentence. The word ‘off’ at the end of the sentence is wrong.

It should be ‘in’ rather than ‘off’. The context of the sentence is that acquired immunity is a result of our interaction with our environment and proper digestion of everything that we eat or goes inside us.

While ‘off’ is adverb that means to removed or separated from something therefore it is wrong in this context.

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