Exp) Option b is the correct answer.

The Sixth Schedule of the Constitution of India deals with special provisions related to the administration of tribal areas in the four north-eastern states of Assam, Meghalaya, Tripura and Mizoram. The tribal areas in these four states have been constituted as autonomous districts and executive power of state extends over these regions too.

Statement 1 is correct: The district councils administer the areas under its jurisdiction. They can make laws on the subject of social customs but it requires assent of the governor to become an act. Also, the District council can make laws on matters related to land, forests, canal water, shifting cultivation, village administration, inheritance of property, marriage and divorce, etc. But all such laws require the assent of the governor.

Statement 2 is incorrect: According to the sixth schedule of the constitution, the Governor can create a new autonomous district as well as alter boundaries of the autonomous district. The governor is empowered to organise and reorganise the autonomous districts and to increase or decrease their areas or change their names or define their boundaries.

Statement 3 is correct: The sixth schedule of the constitution empowers the Governor to make rules to provide for the delimitation of territorial constituencies for the purpose of elections to district councils. Also, the governor can make rules to provide for the qualifications for being elected as members of district/regional councils constituted in tribal areas