Which American entrepreneur is credited with inventing the first true self-service grocery store concept in 1916, revolutionizing retail by allowing customers to select their own merchandise?

The modern shopping experience we take for granted today was once a radical innovation. In the early 20th century, a revolutionary retail concept emerged that fundamentally changed consumer behavior and store operations forever. This trivia question explores a pivotal moment in retail history that transformed how people shop and influenced nearly every aspect of modern commerce from store layout to consumer psychology.

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Clarence Saunders (Piggly Wiggly)
Frank W. Woolworth (Woolworth's)
Sebastian S. Kresge (Kmart)
George H. Hartford (A&P)