The correct answer is A. Scheduled areas and Scheduled Tribes.
The Fifth Schedule to the Constitution of India deals with the administration and control of Scheduled Areas and Scheduled Tribes. It provides for the appointment of a Tribes Advisory Council for each State or Union Territory having Scheduled Areas, and for the administration of these areas by the Governor of the State or Union Territory. The Schedule also contains provisions for the protection of the interests of Scheduled Tribes, including their rights over land and forests.
The other options are incorrect. Option B deals with the Forms of Oaths or Affirmations. Option C deals with the Union list, State list and the concurrent list. Option D deals with Provisions as to disqualification on ground of defection.