Passage Summary: The library rules state you must be fined if you have multiple overdue books, at least one isn't a children's book, and you've been fined before. Because Kessler has three overdue books, the author concludes he must be fined.

Conclusion: Kessler is required to pay a fine to the library.

Reasoning: Kessler currently has three books on loan that are past their due date.

Analysis: The principle provided sets out three specific conditions that must all be met before a fine is mandatory: more than one overdue book, at least one non-children's book, and a prior history of fines. The application tells us Kessler meets the first condition (he has three books), but it says nothing about the other two. To justify the conclusion that he *must* be fined, we need to bridge this gap. Look for an answer choice that explicitly confirms Kessler has at least one adult book overdue and has been fined by the library in the past.