Which retail innovation from the early 1900s first allowed customers to select their own merchandise without clerk assistance, revolutionizing store layouts and shopping behavior?

Before the 20th century, retail looked dramatically different from what we know today. The evolution of store layouts and shopping experiences transformed how consumers interacted with products and brands. This trivia question explores a pivotal innovation in retail history that fundamentally changed the shopping experience and set the foundation for modern retail environments. Test your knowledge of retail history!

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Self-service grocery stores (Piggly Wiggly, founded 1916)
Department store catalogs (Sears Roebuck, 1896)
Shopping malls (Country Club Plaza, 1922)
Cash register systems (NCR, 1884)