The correct answer is A. The year 1972.
Manipur, Tripura and Meghalaya were formed as states of India on 21 January 1972. They were previously part of the state of Assam. The formation of these states was a result of the North-Eastern Areas (Reorganisation) Act, 1971.
The Act was passed by the Parliament of India in December 1971. It provided for the creation of seven new states in the North-East: Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland and Tripura.
The Act was passed in response to the demands of the people of the North-East for greater autonomy and self-determination. It was also seen as a way to address the problems of insurgency and ethnic conflict in the region.
The formation of the new states was a major step in the development of the North-East. It has helped to improve the lives of the people of the region and has contributed to the peace and stability of the region.
The following are the brief descriptions of each option:
- Option A: The year 1972. This is the correct answer. Manipur, Tripura and Meghalaya were formed as states of India on 21 January 1972.
- Option B: The year 1975. This is incorrect. Manipur, Tripura and Meghalaya were formed as states of India on 21 January 1972, not 1975.
- Option C: The year 1976. This is incorrect. Manipur, Tripura and Meghalaya were formed as states of India on 21 January 1972, not 1976.
- Option D: The year 1977. This is incorrect. Manipur, Tripura and Meghalaya were formed as states of India on 21 January 1972, not 1977.