Q: In this task, you're given a four sentences of story written in natural language. Your job is to complete end part of the story by predicting appropriate last sentence which is coherent with the given sentences.
Sentence1: Grace went to the library and checked out a book. Sentence2: When she got home, she found an old photo of a man in the book. Sentence3: She posted the photo on a forum online asking who it was. Sentence4: Grace learned the photo was of the author.
A:
Grace then realized that the book may have been owned by the author.