Which chocolate product was the first to introduce a resealable package design specifically created to address customer feedback about melting and freshness?

In the competitive world of food and cuisine, product launches can make or break a brand. Some food product introductions have revolutionized their categories, creating lasting impacts on consumer behavior and industry standards. This trivia question explores a significant moment in confectionery product design and launch strategy that changed how we think about everyday treats. Test your knowledge of this sweet innovation milestone!

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M&M's 'Melt in your mouth, not in your hand' flip-top box (1941)
Toblerone's triangular prism package (1908)
Cadbury Dairy Milk's flow-wrap with tear strip (1988)
Hershey's Kisses Stand-Up Bag with double-seal technology (2005)