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.

Namdapha National Park is a 1,985 km2 (766 sq mi) large protected area in Arunachal Pradesh of Northeast India. The park was established in 1983.

Mammals:

The red giant flying squirrel is often seen in this park

• The Namdapha flying squirrel (Biswamoyopterus biswasi) was first collected in the park and described. It is endemic to the park and critically endangered. It was last recorded in 1981 in a single valley within the park.
• Because of the elevation range from 300 to 4,500 m (980 to 14,760 ft) and vegetation zones from evergreen, moist deciduous to temperate broadleaved and coniferous forest types to alpine vegetation, the park is home to a great diversity of mammal species. Four pantherine species are found in the park: leopard (Panthera pardus), snow leopard (P. uncia), tiger (P. tigris) and clouded leopard (Neofelis nebulosa).

The red panda is often seen in this park.

• Other predators present in the protected area are dhole, Malayan sun bear, Indian wolf and Asiatic black bear. Smaller carnivores include red panda, red fox, yellow-throated marten, Eurasian otter, Oriental small-clawed otter, spotted linsang, binturong, Asian palm civet, small Indian civet, large Indian civet, masked palm civet, marbled cat, fishing cat, Asian golden cat, and two mongoose species.
• Large herbivores are represented by Indian elephant, wild boar, musk deer, Indian muntjac, hog deer, sambar, gaur, goral, mainland serow, takin and bharal. Non-human primates present include stump-tailed macaque, slow loris, hoolock gibbon, capped langur, Assamese macaque and rhesus macaque.

Butterflies and moths

• The region is very rich in Lepidoptera species. Both butterflies and moths are found in equal abundance here, along with a variety of other insects. As per the observations taken during the National Camp organised in October 2014 by Bombay Natural History Society, a lot of rare species of butterflies were seen.
• These include the koh-i-noor, naga treebrown, red caliph, cruiser, wizard, fluffy tit, East Himalayan purple emperor.

Hence, Option A is Correct.

Dibru-Saikhowa National Park is a national park located in Dibrugarh and Tinsukia districts, Assam, India. It was designated a Biosphere Reserve in July 1997 with an area of 765 km2 (295 sq mi), including a core area of 340 km2 (130 sq mi) and a buffer zone of 425 km2 (164 sq mi).

Flora:

• The forest of Dibru-Saikhowa consists of semi-evergreen forests, deciduous, littoral and swamp forests and patches of wet evergreen forests. The national park is about 35.84% moist mixed forest, 9.50% degraded forest and 21.25% grassland.

Fauna:

• Mammals: 36 mammal species have been recorded, of which 12 are listed in Schedule 1 of the Wildlife (Protection) Act of 1972. Species include Bengal tiger, Indian leopard, clouded leopard, jungle cat, sloth bear, dhole, small Indian civet, Malayan giant squirrel, Chinese pangolin, Ganges dolphin, slow loris, pig tailed macaque, Assamese macaque, rhesus macaque, capped langur, Hoolock gibbon, Asian elephant, wild boar, Sambar deer, hog deer, barking deer, Asiatic water buffalo, and feral horse.
• The park is one of the few places in the world which is home to feral horses. They are descendants of horses who bolted out of stables set up by the British Army in and around Tinsukia during World War II.

Hence, Option A is Correct.