What is a central idea that the author develops throughout The Dark Game?

The Dark Game describes many people who gathered and passed along information during the Civil War, showing that spying was not limited to professional soldiers or officials. Choice B captures this broad idea: ordinary individuals who wanted to help the war effort acted as spies. Choices A and C focus on Elizabeth Van Lew, one specific person, while D makes a claim about counterintelligence that is not the book’s central idea.

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