Which inventor created the first patented self-service grocery store concept in 1917, revolutionizing retail by allowing customers to select their own merchandise without clerk assistance?

The retail landscape has been shaped by countless innovations throughout history. One of the most significant transformations came through the concept of self-service shopping, which fundamentally changed how consumers interact with products and stores. This revolutionary approach eliminated the need for clerk assistance for every purchase and created the foundation for modern retail experiences we take for granted today. Test your knowledge about this pivotal moment in retail innovation history!

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Clarence Saunders with his 'Piggly Wiggly' stores
Sebastian Spering Kresge with his 'S.S. Kresge' stores (later becoming Kmart)
Frank Winfield Woolworth with his 'Woolworth's' five-and-dime stores
George Huntington Hartford with his 'The Great Atlantic & Pacific Tea Company' (A&P)