Which retail innovation, first introduced in 1916 by Clarence Saunders, fundamentally changed shopping by allowing customers to select their own merchandise rather than requesting items from clerks?

The retail landscape we know today has evolved through centuries of innovation and entrepreneurship. Before the age of Amazon and big-box stores, retail pioneers were establishing practices and models that would fundamentally transform how we shop. This trivia question focuses on a pivotal moment in retail history that changed consumer habits forever. Test your knowledge of retail's revolutionary past!

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Piggly Wiggly (the first self-service grocery store)
Marshall Field's (the first department store with price tags)
Woolworth's (the first five-and-dime store chain)
Montgomery Ward (the first mail-order catalog business)