Yup it is correct that one
To explain how wonderful to someone whos not been there
Answer:
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The correct answer is tone. Imagery is using vivid description while style is the personal type of narration like what words they use or grammatical constructions. Theme is the underlying idea while the voice is seen through the tone, whether it's dark and broody or joyful or anything similar.
In Mark Twain's "A Cub Pilot", Mr. Bixby, who is the main captain of the steamboat, plays the role of some sort of mentor to young Mark Twain, someone to look up to, because he has has always wanted to become a steamboat pilot. His main teacher, Mr. Brown, is rude and violent to him, while Mr. Bixby is not. He sort of represents wisdom and young Twain's perseverance to become a pilot in chief.