The correct answer is (c) Changlang.
Namdapha National Park is located in the Changlang district of Arunachal Pradesh. It is the largest national park in India, covering an area of 1,985 square kilometers. The park is home to a wide variety of wildlife, including tigers, elephants, rhinos, and leopards. It is also home to a number of endangered species, such as the clouded leopard and the red panda.
The park was established in 1972 and was declared a tiger reserve in 1973. It is a popular tourist destination and is known for its beautiful scenery and its abundance of wildlife.
The other options are incorrect. Lohit is a district in Arunachal Pradesh, but Namdapha National Park is not located in Lohit district. Tirap is also a district in Arunachal Pradesh, but Namdapha National Park is not located in Tirap district. Longding is a district in Arunachal Pradesh, but Namdapha National Park is not located in Longding district.