Which retail innovation, introduced in 1916 by Clarence Saunders, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

The retail landscape has been shaped by numerous innovations throughout history. One of the most transformative developments changed how consumers interact with products in stores, eliminating the need for clerk assistance and revolutionizing the shopping experience. Test your knowledge of this pivotal retail innovation that fundamentally changed consumer behavior and store design across the globe.

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Piggly Wiggly (the first true self-service grocery store)
A&P Economy Store (the first supermarket chain)
Marshall Field's Department Store (the first modern department store)
Woolworth's Five and Dime (the first discount retail model)