Which wildlife conservation retail innovation first pioneered the 'adopt-an-animal' symbolic adoption program that has since become an industry standard for conservation fundraising?

Conservation organizations are constantly innovating to generate sustainable funding for wildlife protection efforts. Retail strategies have become increasingly important for these organizations, creating unique products that both spread awareness and provide financial support. This poll tests your knowledge about a groundbreaking retail innovation in the wildlife conservation space that changed how conservation merchandise connects with supporters.

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World Wildlife Fund's symbolic animal adoption kits (1973)
National Wildlife Federation's Ranger Rick plush animal line (1982)
The Nature Conservancy's habitat protection certificates (1991)
Defenders of Wildlife's predator protection packages (1988)