Which retail innovation, introduced in the early 20th century, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

Throughout history, retail strategies have evolved dramatically to meet changing consumer demands and technological capabilities. From ancient marketplaces to modern shopping experiences, retailers have constantly innovated their approach to selling products. This poll tests your knowledge about a pivotal moment in retail history that fundamentally changed how consumers shopped and how businesses operated. Can you identify when this retail revolution occurred?

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Self-service grocery stores (pioneered by Piggly Wiggly in 1916)
Department store catalogs (introduced by Montgomery Ward in 1872)
Shopping arcades (popularized in Europe during the 1800s)
Cash register systems (patented by James Ritty in 1879)