The answer is: to reveal the prevailing racist sentiment among the soldiers.
In the excerpt from "Zeitoun," the author describes they way the Syrian protagonist is accused of terrorism by the soldiers. The suspect he might be involved in terrorist activities after they find a lage amount of money and maps of the city in one of his houses.
A rhetorical device uses words in a certain way to convey meaning or to persuade. It can also be a technique to evoke an emotion on the part of the reader or audience.
D. Most fruitful
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B because it will itroduce it in the main idea.