Which packaging innovation of the 1950s revolutionized food retail by allowing consumers to see products before purchase while extending shelf life?

In the history of retail, certain packaging innovations have fundamentally transformed how products are sold, preserved, and consumed. One particular development in the 1950s revolutionized the food industry and changed shopping habits across America and eventually the world. This innovation extended shelf life, reduced costs, and created entirely new categories of consumer products. Test your knowledge about this pivotal moment in retail packaging history!

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Vacuum-sealed tin cans
Clear cellophane wrapping
Transparent polyethylene packaging (clear plastic)
Tetrapak carton containers