Which retail pioneer is credited with inventing the first self-service grocery store layout in 1916, fundamentally changing how people shopped?

In the history of retail, certain innovations fundamentally changed how consumers shop. One particular store layout design from the early 20th century revolutionized the shopping experience and remains the dominant format in grocery and many other retail sectors today. This design eliminated counter service where clerks gathered items for customers, and instead encouraged shoppers to select their own merchandise - a radical concept at the time. Test your knowledge of this pivotal moment in retail history!

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Clarence Saunders (Piggly Wiggly)
Frank W. Woolworth (F.W. Woolworth Company)
Sebastian S. Kresge (S.S. Kresge Company/Kmart)
James Cash Penney (J.C. Penney)