Why does the author uses rhetorical modes in writing

Rhetorical modes help the author convey their message to their audience. Many stories, even nonfiction ones, have some type of moral or bigger message. Rhetorical modes such as narration help explain the message through the eyes of a character, while others such as compare/contrast help illustrate different scenarios in which the message might play out.

answer: idk

explanation:

the answer should be d) he was one of those young thousands who greeted the war with a certain amount of relief, welcoming the liberation from webs of tangled emotion" since it is the best option because it shows his desire to free himself.

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