Which of these wildlife conservation marketing campaigns pioneered the 'adoption' model that allows supporters to symbolically adopt an endangered animal?

Test your knowledge about innovative marketing campaigns in the wildlife conservation sector! Conservation organizations have developed creative ways to raise awareness and funds for protecting endangered species and natural habitats. This poll examines one of the most successful viral marketing campaigns that revolutionized how wildlife conservation organizations connect with donors and supporters. Can you identify which campaign truly changed the game?

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World Wildlife Fund's Adopt an Animal program (launched 1973)
National Wildlife Federation's Wildlife Guardians program (launched 1982)
Conservation International's Species Banking program (launched 1990)
The Nature Conservancy's Animal Ambassador program (launched 1985)