Which two major publishing houses completed a merger in 2013 that created the world's largest book publisher, controlling approximately 25% of the global English-language publishing market?

The publishing industry has witnessed significant brand mergers and acquisitions that have reshaped how literature reaches consumers. Major publishing houses have consolidated power, changing the landscape for authors and readers alike. This trivia question explores one of the most significant brand mergers in the literary world that affected countless bestselling titles and author contracts.

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