Which two major publishing houses merged in 2013 to create the world's largest book publisher, bringing together iconic imprints like Viking, Doubleday, and Knopf under one corporate umbrella?

The publishing world has seen significant consolidation over the years as major literary houses merge to create powerful conglomerates that shape what we read. These mergers have dramatically transformed the landscape of book publishing, affecting everything from author advances to distribution channels and retail partnerships. Test your knowledge about one of the most significant publishing industry mergers that reshaped the literary marketplace in the 21st century.

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Penguin Random House (Penguin Books + Random House)
HarperCollins Simon & Schuster (HarperCollins + Simon & Schuster)
Macmillan Hachette (Macmillan Publishers + Hachette Book Group)
Scholastic Wiley (Scholastic Corporation + John Wiley & Sons)