To persuade readers of the seriousness of the American Civil War is the author's primary purpose for including this detail. Hence, option B is correct.
What are the evidence persuading a reader?
Using evidence helps convince the reader that the author is informed and that the argument is more sound or trustworthy. Statistics, professional opinions, research findings, and anecdotal evidence can all be used to support a position.
When writing to persuade, make an effort to persuade the reader to share your point of view. Non-fiction persuasive writing might take the shape of a speech, a letter, an advertisement, or even an article in a magazine. people can use a variety of approaches to strengthen your writing's persuasiveness.
Thus, option B is correct.
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