The tone of the essay is a reflection of the writer's attitude towards its topic matter. The address to the world war II veterans seems too poetic and informal. Thus, option D is correct.
What is tone?
A tone is a depiction of the attitude of the speaker or the writer with its words and phrases that express their feelings, and thoughts towards the topic issue and the matter.
Here, the address for the veterans sounds poetic and is not delivered in a formal tone. A formal tone is a type of tone that is direct, without slang, and uses respectful words to show the professional context.
Therefore, the tone is inappropriate as it is not formal.
Learn more about formal tone here:
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