The correct answer is: b) Autonomous District Councils.
The Sixth Schedule of the Constitution of India provides for the establishment of autonomous district councils in the areas inhabited by tribal people in the northeastern states of India. The councils are responsible for matters such as local administration, education, health, and land revenue.
Panchayats are local self-government institutions in India. They are responsible for matters such as rural development, agriculture, and rural sanitation.
State Legislatures are the legislative bodies of the states of India. They are responsible for making laws for the state.
High Courts are the highest courts in the states of India. They have original jurisdiction in civil and criminal cases, and they also have appellate jurisdiction from the lower courts.