The region has witnessed a lot of change since 1947. Tripura, Manipur, and Khasi Hills of Meghalaya were the erstwhile Princely States which merged with India after Independence. The entire region of the North-East has undergone considerable political reorganization. The Partition of India in 1947 reduced the Northeast to a land locked region and affected its economy. Cut off from the rest of India, the region suffered neglect in developmental terms.

Arrange the following states in the chronological order of their formations as a state:
A- Manipur
B- Nagaland
C- Arunachal Pradesh

B-A-C

States and their year of formation-

Nagaland- 1963

Manipur - 1972

Arunachal Pradesh - 1987