Which retail innovation, first introduced in 1916, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance?

Before the 20th century, shopping was a very different experience. Customers typically had to ask clerks for items behind counters, haggle over prices, and wait for products to be retrieved. But one innovation changed retail forever, democratizing the shopping experience and establishing the foundation for modern consumption patterns. Test your knowledge of this pivotal moment in retail history!

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Self-service grocery store (Piggly Wiggly)
Department store catalog (Sears Roebuck)
Charge card system (Bloomingdale's)
Drive-through service (A&W Root Beer)