The correct option is C Biosphere reserves
In situ conservation is on-site conservation or the conservation of organisms in natural habitats.
A biosphere reserve is an area proposed by its residents, ratified by a national committee, and designated by 'UNESCO's Man and Biosphere (MAB) program', which demonstrates innovative approaches to living and working in harmony with nature.
A biosphere reserve is the large protected area to conserve wildlife and culture of tribals. The zoo is the man-made area to protect the wild animal. The seed bank is the conservation of wild seeds in the artificial area.