Bogus Book: World's Most

Which of these books is not a real book with the most?

A. The Hedgehog's Dilemma: a Tale of Obsession, Nostalgia, and the World's Most Charming Mammal
B. Becoming Italian: My Love Affair with Italian, the World's Most Beautiful Language
C. Limb from Limb: How I Found Myself by Climbing the World's Biggest Trees
D. Bringing Home the Birkin: My Life in Hot Pursuit of the World's Most Coveted Handbag

(answer after the break)