Which of these sentences is the most subjective in tone?

Many of Alice’s encounters with the other characters make it clear that she has difficulties accepting the rules of the land.
I think that Alice needs to stop arguing with the characters she meets in the Looking-Glass land and just accept the rules.
Because she is an outsider, Alice does not understand the strange rules of the Looking-Glass land.
Throughout the book, Alice struggles to understand the order of the Looking-Glass land.