Which failed product launch in the 1980s cost Coca-Cola millions and is now taught in business schools as a classic example of ignoring customer feedback and brand loyalty?

Even the most successful companies occasionally release products that fail spectacularly in the marketplace. These product flops often become valuable case studies in business schools, teaching important lessons about market research, consumer preferences, and product development. This trivia question focuses on one of the most notorious product launches in retail history that has become a cautionary tale for product managers everywhere.

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New Coke
Crystal Pepsi
Coca-Cola BlāK (coffee-flavored Coke)
Coca-Cola C2 (half-calorie cola)