Which work of literature was NOT authored by a muckraker?

Name: Which work of literature was NOT authored by a muckraker?
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Question

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"Christianity and the Social Crisis" was written by Walter Rauschenbusch, who was not a muckraker but a theologian and key figure in the Social Gospel movement. The other works listed were indeed written by authors considered to be muckrakers: Upton Sinclair wrote "The Jungle," Lincoln Steffens wrote "The Shame of the Cities," and Frank Norris wrote "The Octopus."

Which Work of Literature Was NOT Authored by a Muckraker