Which wildlife conservation marketing campaign pioneered the 'adoption' model that became a standard fundraising approach across conservation organizations worldwide?

Conservation organizations employ various marketing strategies to raise awareness and funding for wildlife protection. One particularly innovative campaign transformed wildlife conservation fundraising and became a model for future efforts. Test your knowledge about this groundbreaking marketing initiative that changed how conservation organizations approach public engagement and corporate partnerships.

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WWF's 'Adopt an Animal' program (1973)
National Wildlife Federation's 'Backyard Wildlife Sanctuary' campaign (1985)
The Nature Conservancy's 'Adopt an Acre' initiative (1991)
Defenders of Wildlife's 'Wolf Compensation Trust' program (1987)