Which retail innovation is credited as the first true self-service grocery store, pioneering the modern supermarket concept in 1916?

While retail has been around since ancient times, the modern supermarket concept revolutionized how people shopped. Before self-service supermarkets emerged, customers would hand shopping lists to clerks who gathered items for them. This trivia question explores a pivotal moment in retail history that forever changed the shopping experience and laid the foundation for today's retail giants.

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Piggly Wiggly, founded by Clarence Saunders in Memphis, Tennessee
A&P Economy Stores, launched by George Huntington Hartford in New Jersey
King Kullen, established by Michael Cullen in Queens, New York
Kroger Grocery, redesigned by Bernard Kroger in Cincinnati, Ohio