Which retail pioneer is credited with inventing the modern self-service shopping model in 1916, allowing customers to select their own products without clerk assistance?

Amazon transformed retail forever, but they weren't the first to revolutionize how we shop. Before online shopping dominated, another retail innovation fundamentally changed American consumer behavior in the 20th century. This poll tests your knowledge of retail history and the pioneering business models that shaped modern commerce. Can you identify which retail visionary first implemented the self-service shopping model that became the foundation of modern retail?

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Clarence Saunders (Piggly Wiggly)
Sebastian Kresge (Kmart)
Frank Woolworth (Woolworth's)
James Cash Penney (JCPenney)