Which retail innovation, first introduced in 1916, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance?

Throughout history, retail has evolved dramatically, transforming how people access and purchase goods. From ancient marketplaces to modern shopping experiences, retail innovation has reflected societal changes and technological advancements. This trivia question focuses on a pivotal moment in retail history that forever changed the shopping landscape and customer experience. Test your knowledge about this revolutionary retail concept that shaped modern commerce!

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Self-service grocery store (Piggly Wiggly)
Department store with multiple sections (Marshall Field's)
Mail-order catalog shopping (Montgomery Ward)
Shopping arcade with multiple vendors (The Arcade Providence)