Which retail innovation, first introduced in 1916, fundamentally changed the customer experience by allowing shoppers to select their own merchandise without clerk assistance?

Throughout history, retail has undergone remarkable transformations. From ancient marketplaces to today's omnichannel experiences, the evolution of how we shop reflects broader social and technological changes. This trivia question focuses on a pivotal moment in retail history that fundamentally changed the customer experience and set the stage for modern shopping as we know it today.

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The self-service grocery store (Piggly Wiggly)
The department store catalog (Sears Roebuck)
The shopping mall (Country Club Plaza)
The punch card inventory system (IBM)