If the library is open on Sunday, then Meera returns the books. If Meera returns the books, then Meera pays no fine. It turns out that Meera pays a fine. Which of the following must be true?
Correct answer B. The library is not open on Sunday.
Explanation
By the contrapositive, if Meera pays a fine, then Meera does not return the books, and therefore the library is not open on Sunday (modus tollens applied twice).
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