Which famous advertising campaign is credited with igniting the modern 'Cola Wars' between Coca-Cola and Pepsi in the 1980s?

In the world of pop culture, few marketing moments are as memorable as when competing brands directly challenge each other in their advertising campaigns. These 'brand wars' often produce some of the most creative, cutting, and culturally significant commercials we remember decades later. This trivia question tests your knowledge about one of the most famous advertising rivalries that shaped consumer culture and created lasting catchphrases. Can you identify which campaign truly sparked the famous 'cola wars'?

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Pepsi's 'Pepsi Challenge' blind taste test campaign
Coca-Cola's 'I'd Like to Buy the World a Coke' hillside commercial
Pepsi's celebrity endorsements featuring Michael Jackson
Coca-Cola's launch of 'New Coke' as a direct response to Pepsi