Which retail innovation, first introduced by Clarence Saunders in 1916, revolutionized shopping by allowing customers to select their own merchandise rather than requesting items from clerks?

Before modern retail experiences became commonplace, several groundbreaking innovations transformed how consumers interacted with merchants and products. One particular innovation from the early 20th century fundamentally changed the shopping experience and set the foundation for modern retail as we know it. Test your knowledge of this pivotal moment in retail history that influenced customer service, store layouts, and shopping psychology for generations to come.

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The self-service grocery store (Piggly Wiggly)
The department store credit card (Filene's)
The mail-order catalog with money-back guarantee (Montgomery Ward)
The shopping cart (introduced by Sylvan Goldman)