The dialogue mostly matches what people really said is an example of the statement that best describes literary nonfiction.
Literary nonfiction is a genre that covers all texts based on facts or reality that are written using literary elements. This includes the use of:
In this genre, most elements including dialogues are characters are based on reality. This means the author describes real people and their words, appearance, etc. However, there can be slight changes to make the story more entertaining.
Based on this, it can be concluded dialogues mostly matches what a person really said (option B).
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