<span>A nonfiction book about the history of the Civil War is an example of expository writing. The main purpose of expository writing is to convey information about an issue, method, subject, or an idea and explain it in a logical and straightforward manner. The most common example of this are newspapers, instruction manuals, encyclopedia, textbooks and essays.
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i say B.
Decorous
in keeping with good taste and propriety; polite and restrained.
