Which sentence provides the BEST example of a thesis statement based on textual evidence in The Diary of a Young Girl?

Anne Frank's diary was written while she and her family hid from the Nazis between 1942 and 1944.
Anne Frank's diary helped her connect with her family because it let her tell them how she really felt.
Anne Frank learned how cruel the world could be but also realized her own capacity for cruelty.
Anne Frank's diary was the only personal object from the Secret Annex to survive the Holocaust.