Explanation

Pair I — Arunachal Pradesh
This pair is correct. The capital of Arunachal Pradesh, Itanagar, is named after the historic Ita Fort (“fort of bricks”). The state also has two national parks — Namdapha National Park and Mouling National Park.

Pair II — Nagaland
This pair is also correct as per UPSC. Nagaland attained statehood in 1963 and this process was associated with the 13th Constitutional Amendment Act, 1962, which inserted Article 371A providing special provisions for the state. Along with the State of Nagaland Act, 1962, the Constitutional Amendment formed the basis of Nagaland’s creation as a state. Hence, UPSC considered the statement valid.

Pair III — Tripura
This pair is correct. Tripura was initially a Part ‘C’ State after independence. Following the States Reorganisation in 1956, it became a Union Territory, and later attained full statehood in 1972.

Therefore, all the three pairs are correctly matched.
Correct Answer: (C) All the three