The disjunction of statement :"The college is closed if and only if it is Sunday."

The college is closed and it is Sunday.

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The college is closed if and only if it is Sunday.

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The college is closed or it is Sunday.

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The college is closed if it is Sunday.

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Solution

The correct option is B The college is closed or it is Sunday.
Disjuntion is the relation of two distinct alternatives.
So, two alternatives are joined by 'or'.
hence $C$ is correct.

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