Which historic product development decision by Coca-Cola in 1985 is widely considered one of the biggest marketing blunders in business history?

Throughout history, successful brands have evolved while maintaining their core identity. Coca-Cola, one of the world's most recognized brands, has a fascinating history of product development and marketing changes that reflect broader historical trends. This poll tests your knowledge about a pivotal moment in Coca-Cola's product history that intersected with significant cultural and historical events.

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New Coke: Changing the original Coca-Cola formula and replacing it with a sweeter version
Coca-Cola Clear: Introducing a transparent version of the beverage to compete with emerging clear sodas
Diet Coke: Launching the first major diet cola product in the company's portfolio
Coca-Cola International: The failed attempt to create country-specific flavors for major global markets