Which packaging innovation from the 1960s revolutionized beverage retail by allowing consumers to easily open cans without a separate tool for the first time?

In the history of retail, certain packaging innovations have dramatically transformed how products are sold, stored, and consumed. These breakthroughs not only solved practical problems but often revolutionized entire industries and consumer behaviors. This trivia question explores one such pivotal moment in retail history that fundamentally changed shopping patterns worldwide and created new possibilities for product distribution.

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The pull-tab (ring-pull) can opener
The plastic screw-top bottle
The TetraPak cardboard carton
The twist-off metal bottle cap