Which packaging innovation from the 1950s fundamentally changed retail by enabling the rise of self-service grocery stores and supermarkets?

The history of retail has been marked by revolutionary innovations in packaging design that transformed how products were sold and consumed. These packaging innovations not only changed consumer behavior but also reflected broader societal changes throughout different historical periods. Test your knowledge of how packaging design has evolved through the ages and shaped retail history!

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The Tetra Pak, which allowed milk and other liquids to be stored without refrigeration
Aerosol spray cans, which revolutionized the distribution of everything from paint to whipped cream
Cellophane wrapping for food products, which allowed customers to see what they were buying without handling it
The aluminum beverage can with pull-tab opener, which changed the portable drinks market