Which market research project holds the Guinness World Record for the largest single consumer research study ever conducted, surveying over 20 million people across 34 countries?

The world of market research has its own impressive records! Companies invest millions to understand consumer behavior, sometimes creating massive studies that break records in scale, participation, or duration. This poll tests your knowledge about an extraordinary market research achievement that entered the Guinness World Records. Can you identify the correct record-holding consumer study from these options?

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Coca-Cola's 'Project Connect' global taste preference study
The Nielsen Global Consumer Confidence Survey
Procter & Gamble's 'Consumer 360' household products analysis
Amazon's 'Prime Evolution' e-commerce behavior study