Which food retailer first introduced the modern self-service grocery store concept, allowing customers to select their own products rather than having clerks gather items for them?

Modern grocery stores have evolved dramatically over the decades, transforming how we discover and purchase food products. Behind many innovations were visionary retailers who changed the food shopping experience forever. This trivia question explores a pivotal innovation in food retail history that fundamentally altered how consumers interact with food products and shaped today's shopping experience.

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Piggly Wiggly (founded by Clarence Saunders in 1916)
A&P (The Great Atlantic & Pacific Tea Company, 1912)
Safeway (founded as Sam Seelig Company in 1915)
Kroger (founded by Bernard Kroger in 1883)