Nagarahole National Park is a national park located in Kodagu district and Mysore district in Karnataka, India. This park was declared the 37th Tiger Reserve of India in 1999. It is part of the Nilgiri Biosphere Reserve. 

Nagarhole National Park Flora

• The North Western Ghats’ moist deciduous forests dominate the vegetation in Nagarhole National Park, with teak and rosewood ruling in the southern regions. Rosewood, teak, sandalwood, and silver oak are the primary trees present, all of which are significant commercially. Other tree species that can be found in woodlands include Schleichera trijuga, some ficus species, kadam, cotton tree, and Lagerstroemia microcarpa (crepe myrtle).

Nagarhole National Park Fauna

• The Bengal tiger, Indian leopard, dhole, sloth bear, and striped hyena are the main canines and predators in Nagarhole National Park. Chital, sambar deer, barking deer, four-horned antelope, gaur, wild pig, and Indian elephant are among the herbivores. Nagarhole National Park is home to a wide variety of reptiles and more than 250 bird species.

Hence, Option A is Correct.

Eravikulam National Park is a 97 km2 national park located along the Western Ghats in the Idukki and Ernakulam districts of Kerala in India. It is the first national park in Kerala. It was established in 1978.

Flora

• Neelakurinji, a mass flowering plant which blooms once in twelve years, grows in abundance in the Eravikulam Park. The park is a must-visit place during the kurinji flowering season.
• Large number of rare varieties of plants, quite endemic to the Western Ghats, grows in the park.

Fauna

• Besides the Nilgiri Tahr, the prestigious inhabitant of the park is Atlas Moth (Attacus atlas), which has the largest surface area of wings among all moths.
• Twenty-six species of mammals have been identified in the park. Besides the Nilgiri Tahr, the ungulates in the park include Gaur, Indian Muntjac and Sambar Deer. The predators include Golden Jackal, Jungle Cat, Wild Dog, Dhole, Leopard and tiger. Nilgiri Langur, Stripe-necked Mongoose, Indian Porcupine, Nilgiri Marten, Small Clawed Otter, Ruddy Mongoose, and Dusky Striped Squirrel are also among the inhabitants of the park.
• Nilgiri Marten, Small Clawed Otter, Ruddy Mongoose, Small Indian Civet and Macaques can also be spotted in the park. 

Hence, Option D is correct.

Mudumalai National Park is a national park in the Nilgiri Mountains in Tamil Nadu in southern India. It covers 321 km2 (124 sq mi) at an elevation range of 850–1,250 m (2,790–4,100 ft) in the Nilgiri District and shares boundaries with the states of Karnataka and Kerala. A part of this area has been protected since 1940. The national park has been part of Nilgiri Biosphere Reserve since 1986 and was declared a tiger reserve together with a buffer zone of 367.59 km2 (141.93 sq mi) in 2007. 

The forest is divided into three categories:

• Tropical Moist Deciduous
• Tropical Dry Deciduous
• Southern Tropical Dry Thorn
• Bamboo, natural Teak, Aredesia, Rosewood, Sandalwood, Jacaranda, Mango, Jamun, Tamarind, Banyan, Pipal, Cinnamon, Ginger, Wild Rice, Pepper, Turmeric, and Plumeria grow abundantly in Mudumalai forest area.

Mudumalai National Park is home to 55 species of mammals, and over 80 BENGAL TIGERS! The mammals that cn spotted here include deer, gaur, Indian elephant, Bengal tiger, striped hyena, golden jackal, bonnet macaque, leopard cat, jungle cat, among others. Rodents include the Indian Giant Squirrel, flying squirrel, and rats. Reptiles include spectacled cobra, Asian pit vipers, pythons, flying lizards, krait, and monitor lizards.

Mudumalai houses 227 species of birds, that is, 8% of the total bird species found in India. Here, one can spot birds like Black Flycatcher, Orange Flycatcher, Malabar Grey Hornbill, Malabar Trogon, Serpent Eagle, Mottled Wood Owl, Crested Goshawk, Minivets, Rufous Bellied Hawk Eagle, and many more.

Hence, option C is correct.