When looking at the style of an essay, you should look for the correct use of formal language as the essay's informal language is characterized by purpose, dignity, and length.
What do you mean by an essay?
An essay refers to a piece of writing giving its argument. There are two types of essays i.e. formal and informal essays.
Formal essays have some serious purpose, length, and dignity. Correct use of formal language is reviewing the style of an essay.
Therefore, D is the correct option.
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