Which retail consumer trend did the World Wildlife Fund (WWF) pioneer in conservation marketing with its 'adoption' program in the 1980s?

In the competitive world of animal conservation fundraising, organizations must use innovative marketing strategies to capture public attention and support. One particular campaign revolutionized how conservation organizations approach retail consumer engagement. Test your knowledge about this landmark marketing initiative that changed wildlife conservation fundraising forever!

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Experiential merchandise: allowing consumers to 'adopt' endangered animals with plush toys and certificates
Celebrity-endorsed limited edition conservation products with proceeds going to wildlife protection
Subscription box service delivering educational wildlife content and sustainable products monthly
Gamified mobile app purchases that tracked real animals in the wild with satellite technology