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

The history of retail has transformed how we shop and consume products. From ancient marketplaces to digital storefronts, retail innovation has shaped economies and cultures. This trivia question focuses on a pivotal moment in retail history that forever changed the shopping experience for consumers worldwide. Test your knowledge about this revolutionary retail concept that set the foundation for modern shopping as we know it today.

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Self-service grocery store (Piggly Wiggly)
Department store with multiple sections (Marshall Field's)
Mail-order catalog shopping (Montgomery Ward)
Price-marked merchandise (F.W. Woolworth)