Answer: Option D
:
D
The IUCN (International Union for Conservation of Nature and Natural resources) maintainsa Red List, which contains a record of species, which have been categorised into nine groups based on how close they are to extinction.These include extinct, extinct in the wild, critically endangered, endangered, vulnerable, near threatened, least concern, data deficient and not evaluated. As the number of individuals of a particular species reduces, the closer the species would move towards the category of extinction.