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Option 3 : C)

Option 3 is correct as,

 A modal is a verb that combines with another verb to indicate mood or tense.

A modal, also known as a modal auxiliary or modal verb, expresses necessity, uncertainty, possibility, or permission.

Also 'lest' is followed by 'should' and not 'could'.

Hence in Part C of the given sentence, 'could' will be replaced by 'should'.

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