Confused

I choose D as well and was wondering why that was wrong!

D is wrong because although it did refer to prior overdue charges, it doesn't mention about how many books are currently overdue and if any of them are not children books. At least this was my reasoning for crossing it out.

Hi all, @Eugenia-Ouyang is very close! The stimulus does tell us how many books are currently overdue. Kessler has three overdue books, so Kessler satisfies that requirement. However, as Eugenia points out, (D) does not tell us if any of Kessler's books that are currently overdue are children's books or not, and so (D) is not the answer. (B) does provide both remaining conditions. It tells us that one of the overdue books is not a children's book, and he has been fined in the past before. Hope this helps!