I just finished reading Anne Frank's diary for school, and I believe the book she was reading was 1, or "What Do You Think of the Modern Girl." I remember on my book, the entry was about 5-7 (?) pages long, and at the very beginning of it, she mentioned that very book. It wasn't anything about boys, Jews, or war because I remember her saying some of the details in the book applied to her (not that this is a direct quote; she said something along those lines).
But yeah, the answer is number 1! Hope this helps you! :)
