Which retail innovation, first introduced by Clarence Saunders in 1916, revolutionized grocery shopping by allowing customers to select their own merchandise?

The early 20th century saw a dramatic transformation in how Americans shopped for groceries. Before this innovation, customers would hand their shopping lists to clerks who would gather items from behind counters - a time-consuming process with limited product visibility. One visionary retailer changed everything with a revolutionary concept that empowered shoppers and fundamentally altered the retail landscape. Test your knowledge of this pivotal moment in retail history!

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Piggly Wiggly self-service stores
A&P's supermarket format
Woolworth's five-and-dime stores
Sears mail-order catalog system