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

The retail landscape we know today has evolved dramatically over centuries. From small general stores to massive department stores to online marketplaces, retail history tells us much about economic development, consumer culture, and technological innovation. This trivia question focuses on a pivotal moment in retail history that fundamentally changed how people shop. Test your knowledge of retail's transformative past!

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Self-service grocery store (Piggly Wiggly)
Department store with multiple specialized sections (Marshall Field's)
Mail-order catalog shopping (Montgomery Ward)
Discount chain store model (Woolworth's)