Which major publishing merger, completed in 2013, created the 'Big Five' era in book publishing by forming the world's largest trade book publisher?

The publishing industry has seen significant consolidation over the past decades, with major mergers reshaping how literature reaches readers. These corporate maneuvers have dramatically altered the landscape for authors, bookstores, and readers alike. Test your knowledge about one of the most significant publishing mergers in recent history that created the world's largest book publisher and changed the dynamics of the literary marketplace.

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Penguin Random House (merger of Penguin Books and Random House)
HarperCollins Partners (merger of Harper & Row and Collins Publishers)
Simon & Schuster Hachette (merger of Simon & Schuster and Hachette Book Group)
Macmillan Bloomsbury (merger of Macmillan Publishers and Bloomsbury Publishing)