Kaziranga National Park is a national park in the Golaghat and Nagaon districts of the state of Assam, India. The park, which hosts two-thirds of the world's Indian rhinoceroses, is a UNESCO World Heritage Site.

Fauna of Kaziranga National Park:

• Kaziranga contains significant breeding populations of 35 mammalian species, of which 15 are threatened as per the IUCN Red List.
• The park has the distinction of being home to the world's largest population of the Indian rhinoceros (2,401), wild water buffalo (1,666)and eastern swamp deer (468).
• Significant populations of large herbivores include Indian elephants (1,940), gaur (1300) and sambar (58). Small herbivores include the chital, Indian muntjac, Indian boar and Indian hog deer.
• Kaziranga has the largest population of the Wild water buffalo anywhere accounting for about 57% of the world population.
• The Indian rhinoceros, royal Bengal tiger, Asian elephant, wild water buffalo and swamp deer are collectively known as 'Big Five' of Kaziranga.
• Kaziranga has been identified by Birdlife International as an Important Bird Area.
• Kaziranga was once home to seven species of vultures, but the vulture population reached near extinction, supposedly by feeding on animal carcasses containing the drug Diclofenac.
• Only the Indian vulture, slender-billed vulture, and white-rumped vulture have survived. Game birds include the swamp francolin, Bengal florican, and pale-capped pigeon.
• Two of the largest snakes in the world, the reticulated python and Indian rock python, as well as the longest venomous snake in the world, the king cobra, inhabit the park.

Hence, Option D is Correct.

Orang National Park, or the Rajiv Gandhi Orang National Park, is a national park and wildlife refuge situated in northeastern India, on the northern bank of the Brahmaputra River, in the Darrang and Sonitpur Districts of the state of Assam. In total, the park covers an area of 79.28 km2 (30.61 sq mi).

Fauna:

Mammalian species:

• Orang park contains significant breeding populations of several mammalian species.
• Apart from the great Indian one-horned rhinoceros (68 at the last count), which is the dominant species of the national park, the other key species sharing the habitat are the royal Bengal tiger (Panthera tigris), Asiatic elephant, pygmy hog, hog deer and wild boar.
• Some important species of the critically endangered and endangered category are the following.
• The Bengal tiger (Panthera tigris tigris) population was estimated to comprise 19 individuals in 2000, based on pug marks.

Fishes:

• More than 50 species of fish have been recorded in the river and channels flowing through the park.

Avian fauna

• Due to its variety of birdlife, including endangered and rare species, the park is listed as one of BirdLife International's "Important Bird and Biodiversity Areas" (IBAs); they consider it the most important bird wet-grassland site on the Indo-Gangetic plain, and one of three "outstanding" IBAs in Assam.
• It is home to a variety of migratory birds, water birds, predators, scavengers and game birds.

Hence, Option C is Correct.

Nameri National Park is a national park in the foothills of the eastern Himalayas in the Sonitpur District of Assam, India. Together they constitute an area of over 1,000 km2 (390 sq mi), of which Nameri has a total area of 212 km2 (82 sq mi).  Nameri National Park was declared as Tiger Reserve in the year 1999-2000, and is the second Tiger reserve of Assam after Manas Tiger Reserve.

Flora:

• Nameri National Park harbours over 600 floral species. Some notable species are Gmelina arborea, Michelia champaca, Amoora wallichi, Chukrasia tabularis, Ajar, Urium poma, Bhelu, Agaru, Rudraksha, Bonjolokia, Hatipolia akhakan, Hollock, Nahor. It is home for orchids like Dendrobium, Cymbidium and Cypripedioideae.

Fauna:

• Nameri National Park provides habitat for Bengal tiger, Indian leopard, clouded leopard, marbled cat, leopard cat, hog deer, sambar, dhole, gaur, barking deer, wild boar, sloth bear, Himalayan black bear, capped langur and Indian giant squirrel. The white winged wood duck, great pied hornbill, wreathed hornbill, rufous necked hornbill, black stork, ibisbill, blue-bearded bee-eaters, babblers, plovers and many other birds are also present.
• In 2005, 374 bird species were recorded in Nameri National Park.

Hence, Option C is Correct.