The correct answer is option 4 - Sixth Schedule. The Sixth Schedule to the Constitution of India deals with the provisions related to the administration of tribal areas in four states of the country, namely Assam, Meghalaya, Tripura, and Mizoram. It provides for the creation of autonomous district councils (ADCs) in these tribal areas to protect the interests and promote the welfare of the tribal communities living there.

The ADCs have the power to make laws on various subjects including land, forests, and local government. They also have the authority to levy taxes, manage the administration of the autonomous districts, and safeguard the social, cultural, and economic interests of the tribal communities.

Option 1 - Third Schedule does not deal with the setting up of Autonomous District Councils.

Option 2 - Fourth Schedule contains details about the allocation of seats in the Rajya Sabha (upper house of the Parliament) for the different states and union territories.

Option 3 - Fifth Schedule provides for the administration and control of Scheduled Areas and Scheduled Tribes in various states.

Therefore, the correct answer is option 4 - Sixth Schedule.