According to "Introduction to Cultural Rebellion: Mid-Twentieth-Century Voices," which best states a key motivating factor for postwar American authors in a variety of genres?

Postwar American authors across genres were often motivated by rebellion against the norms and assumptions of mainstream society. Their work questioned or challenged established political and social values, rather than simply agreeing with them or ignoring them. Therefore, the best choice is “a disagreement with mainstream political and social values.”

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