Which of the following best describes Upton Sinclair, Ida Tarbell, and Frank Norris's impact on journalism?

Upton Sinclair, Ida Tarbell, and Frank Norris were muckrakers who exposed corruption and abuses by powerful businesses. Sinclair wrote about unsafe conditions in the meatpacking industry, Tarbell investigated Standard Oil, and Norris criticized railroad monopolies. Their reporting publicized the immoral practices of large industries, making A the best answer. Tarbell’s work helped build pressure against Standard Oil, but the Supreme Court—not the journalists—ordered its breakup.

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