Which chocolate product innovation, introduced in 1932, revolutionized the industry by solving the problem of chocolate melting in warm weather?

The chocolate industry has seen numerous innovations throughout its history, but one particular product development in the 1930s revolutionized how consumers enjoyed chocolate worldwide. This innovation changed chocolate from primarily a beverage or luxury confection into an everyday treat accessible to the masses. Test your knowledge about this pivotal moment in food product history that transformed both consumption habits and marketing approaches!

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Mars Bar's nougat center
Cadbury's Dairy Milk foil wrapping
M&M's candy coating ('melts in your mouth, not in your hands')
Hershey's Kiss aluminum foil packaging