The correct option is D Critically endangered
A Critically Endangered (CR) species is one which has been categorized by the International Union for Conservation of Nature (IUCN) as they are less in number and facing a very high risk of extinction in immediate future e.g., Panthera pardus orientalis, whereas, endangered species are species that are at the risk of extinction but the risk is not higher as compared to the critically endangered species, e.g., Panthera tigris altaica.