That the fairies do something wrong for a wille but the they do something better
The correct option is this: Young children are not allowed to borrow books on their own.
From the above excerpt, we can see that the writer is a young child who loves to read. Mrs Long usually ask her the books she desires to read and when she mentioned them, Mrs long will go to the town library, to get the books for her.
Mrs Long has to do this because children are not giving the privilege of borrowing books.
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Your question is incomplete.
I'm confused about what your asking for.