The group of animals that belongs to the category of endangered species is Snow Leopard, Swamp Deer, Rhesus Monkey and Saras (Crane).

Snow Leopard, Swamp Deer, Rhesus Monkey, and Saras (Crane) are all listed as endangered species in India. Snow Leopard is a large cat species found in the Himalayan region and is classified as endangered due to habitat loss, poaching, and other threats. Swamp Deer, also known as Barasingha, is a deer species found in swampy areas and is endangered due to habitat loss and poaching. Rhesus Monkey, a species of Old World monkey, is endangered due to habitat destruction and hunting. Saras or Indian Sarus Crane, is the world`s tallest flying bird and is endangered due to habitat loss and degradation.

Great Indian Bustard, Musk Deer, Red Panda, Asiatic Wild Ass, Kashmir Stag, Cheetal, Blue Bull, Great Indian Bustard, Lion-tailed Macaque, Hanuman Langur, and Cheetal are also endangered species in India, but they are not all grouped together as a single category.

Hence, the correct answer is option (c) Snow Leopard, Swamp Deer, Rhesus Monkey and Saras (Crane).