Answer:
Mentors
Explanation:
Because Friendship is literally the theme of the entire novel, and plays a major part in it as well.
Loyalty is made throughout the entire novel with each character including Mole and Rat.
And BEAUTY is made throughout the novel as well because of how naturally appealing and beautiful the settings and events that happen are.
so the answer is D MENTORS because it's not a theme what so ever in the entire novel.
