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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 when we are talking about a case of less possibility in the past, we use the modal 'could'.
Hence in Part C of the given sentence, 'can' will be replaced by 'could'.
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