The correct answer is option 1 ("Is 'Because of Winn-Dixie your favorite book?'").
Statistical questions can be identified as they contain various elements or information that could be compared with each other.
In questions 2 and 4, we could use a graphic or histogram to contrast the number of books each student read either last month or over the summer, after gathering the results.
The answers to question 3 would also lead us to statistical data with which we could compare the amount of books that each student owns.
Question 1, however, is only asking for a simple yes-or-no answer. That's why it's non-statistical, it does not serve us to start any sort of comparisson.
Hope this helps!