Which supply chain innovation most dramatically extended the shelf life of food products in retail stores during the 20th century, allowing for modern supermarket distribution?

Supply chain innovation has transformed how food products reach consumers. Before modern preservation techniques, grocery stores operated very differently. This trivia question explores a pivotal development that revolutionized food retail by dramatically extending product shelf life and changing how consumers interact with food products. Test your knowledge about this supply chain transformation that fundamentally altered the food industry landscape.

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Flash freezing technology (introduced by Clarence Birdseye in the 1920s)
Vacuum sealing (commercially widespread in the 1940s)
Modified atmosphere packaging (commercially adopted in the 1970s)
High-pressure processing (introduced commercially in the 1990s)