Which wildlife conservation organization pioneered the 'adoption' marketing model that revolutionized emotional brand positioning by allowing supporters to symbolically adopt endangered animals?

Conservation organizations often use strategic brand positioning to raise awareness and funds for endangered species. This poll tests your knowledge about innovative marketing approaches in the wildlife protection sector. Can you identify which groundbreaking campaign transformed how we connect emotional branding with animal conservation?

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World Wildlife Fund (WWF) with their symbolic animal adoption program launched in 1973
The Nature Conservancy with their 'Adopt an Acre' program launched in 1991
Conservation International with their 'Adopt a Species' campaign launched in 1987
National Wildlife Federation with their 'Wildlife Guardians' program launched in 1982