The correct option is C IUCN
Our planet Earth is endowed with enormous and rich biodiversity.
But unfortunately, this biological wealth is rapidly declining due to human activities.
Some examples of recent extinctions include dodo (Mauritius), quagga (Africa), thylacine (Australia), Steller’s Sea Cow (Russia) and three subspecies (Bali, Javan, Caspian) of tiger.
With this alarming rate of species extinction, an international organization IUCN (International Union for Conservation of Nature) working in the field of conservation of nature and sustainable use of natural resources created the Red List of Threatened Species. It is a comprehensive document of the global conservation status of biological species.
The IUCN Red List (2004) documents the extinction of 784 species in the last 500 years which is quite alarming. Of this, 338 are vertebrates, 359 are invertebrates and 87 are plant species.
ICFRE is the Indian Council of Forestry Research and Education. It conducts forestry research. Its headquarters is in Dehradun.
UNEP is the United Nations Environment Programme whose function is to coordinate responses to the environmental issues in the United Nations. It helps to give solutions to environmental issues such as climate change, maintenance of marine and terrestrial ecosystems, maintenance of greenery etc.
WWF is the World-Wide Fund for Nature. It is a leading international organisation which aims at the conservation of wildlife and endangered species.