Which of the following publishing house mergers created the world's largest book publisher when it was completed in 2013?

The publishing world has seen significant consolidation over the past few decades, with major mergers reshaping the landscape of literature distribution. These corporate maneuvers have profound impacts on authors, readers, and the entire ecosystem of book creation and distribution. Test your knowledge of the business side of literature with this publishing industry trivia!

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Penguin Books and Random House
HarperCollins and Simon & Schuster
Macmillan and Hachette Book Group
Oxford University Press and Cambridge University Press