The correct answer is: c) Deputy Commissioner.
The Deputy Commissioner is the head of the district administration in Arunachal Pradesh. He/She is appointed by the Governor of Arunachal Pradesh and is responsible for the implementation of all government policies and programmes in the district. The Deputy Commissioner is also the chairman of the District Planning Committee and the District Disaster Management Authority.
The Chief Minister is the head of the state government and is responsible for the overall administration of the state. The Governor is the head of the state and is the constitutional head of the state. The Zilla Parishad Chairperson is the head of the Zilla Parishad, which is a local self-government body in the district.
The Deputy Commissioner is the most important official in the district administration. He/She is responsible for the day-to-day administration of the district and is the link between the state government and the people of the district. The Deputy Commissioner is also responsible for the maintenance of law and order in the district.