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.
Indeed is one word, other than that I think the entire thing is very good.
You need to add where we find the answer from.. repost a question with a picture to this question
Answer:
Your books will lie there until you lay them elsewhere.
John Muir makes an effective argument for saving the redwoods. He appeals to logic by giving evidence about the destruction. He seems very credible because he knows about the history of individual trees. Finally, he makes readers want to save the trees by using strong emotional language throughout.