Which retail pioneer invented the first true self-service grocery store concept in 1916, allowing customers to select their own merchandise without clerk assistance?

The way we shop today seems natural, but it was once revolutionary. Before the early 20th century, customers didn't browse stores themselves - they would hand their shopping lists to clerks who fetched items from behind counters. This poll tests your knowledge about a pivotal innovation in retail history that fundamentally changed how we interact with products and transformed the shopping experience forever.

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