The correct answer is: a) Arunachal Pradesh.
The Balipara Frontier Tract and Tirap Frontier Tract were administrative divisions created by the British in the region that is now Arunachal Pradesh. The Balipara Frontier Tract was created in 1873, and the Tirap Frontier Tract was created in 1890. Both tracts were administered by the British government through the Chief Commissioner of Assam.
In 1947, when India gained independence from British rule, the Balipara Frontier Tract and Tirap Frontier Tract became part of the Indian state of Assam. In 1972, the two tracts were merged to form the new state of Arunachal Pradesh.
Arunachal Pradesh is a state in northeastern India. It is the largest state in India by area, but it has the lowest population density. The capital of Arunachal Pradesh is Itanagar.
The majority of the people of Arunachal Pradesh are tribal people. The main languages spoken in Arunachal Pradesh are Assamese, Hindi, and English.
Arunachal Pradesh is a beautiful state with a rich culture and history. It is a popular tourist destination, and it is home to many national parks and wildlife sanctuaries.
The other options are incorrect because they are not the regions that were administered by the British government through the Chief Commissioner of Assam.