Consider the following pairs: [Local Government]

State	Description
I. Arunachal Pradesh	The capital is named after a fort, and the State has two National Parks
II. Nagaland	The State came into existence on the basis of a Constitutional Amendment Act
III. Tripura	Initially a Part ‘C’ State, it became a centrally administered territory with the reorganisation of States in 1956 and later attained the status of a full-fledged State

How many of the above pairs are correctly matched?

The correct option is All the three.

Let us verify and understand why each of the given pairs is correctly matched:

Pair I: Arunachal Pradesh - The capital is named after a fort, and the State has two National Parks.
- The capital of Arunachal Pradesh is Itanagar, which is named after 'Ita Fort' (meaning fort of bricks, built in the 14th or 15th century).
- Arunachal Pradesh has two National Parks: Namdapha National Park and Mouling National Park.
Hence, Pair I is correctly matched.

Pair II: Nagaland - The State came into existence on the basis of a Constitutional Amendment Act.
- Nagaland was formed as the 16th state of the Indian Union on December 1, 1963.
- Its creation was enabled by the 13th Constitutional Amendment Act, 1962, which inserted Article 371A to provide special provisions for the state.
Hence, Pair II is correctly matched.

Pair III: Tripura - Initially a Part ‘C’ State, it became a centrally administered territory with the reorganisation of States in 1956 and later attained the status of a full-fledged State.
- Following the merger agreement in 1949, Tripura became a Part 'C' State of the Indian Union.
- Under the States Reorganisation Act of 1956, Part 'C' states were abolished, and Tripura became a Union Territory (centrally administered territory) on November 1, 1956.
- Subsequently, under the North-Eastern Areas (Reorganisation) Act, 1971, Tripura attained full statehood on January 21, 1972.
Hence, Pair III is correctly matched.

Since all three pairs (I, II, and III) are correctly matched, the correct choice is indeed All the three.