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

The retail landscape has evolved dramatically throughout history, with innovations that fundamentally changed how people shop. From ancient marketplaces to today's omnichannel experiences, certain retail innovations stood out as true game-changers. This trivia question focuses on a pivotal moment in retail history that transformed customer experience and set the foundation for modern shopping concepts we take for granted today. Test your knowledge about this revolutionary retail development!

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The self-service grocery store (Piggly Wiggly)
The shopping mall (Market Square in Lake Forest, Illinois)
The department store (Bon Marché in Paris)
The mail-order catalog (Montgomery Ward)