In 1985, which infamous product decision did Coca-Cola make that led to massive consumer backlash and is now studied as one of the biggest marketing blunders in history?

The 'Cola Wars' between Coca-Cola and Pepsi represent one of the most iconic corporate rivalries in business history. Throughout the decades, these beverage giants deployed innovative marketing strategies, celebrity endorsements, and even reformulations to gain market share. This trivia question focuses on a pivotal moment in this historic product battle that shocked consumers and became a cautionary tale in product development history.

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Introducing 'New Coke' by changing their original formula
Removing caffeine from all Coca-Cola products
Discontinuing glass bottles in favor of plastic only
Attempting to acquire Pepsi in a hostile takeover