The correct answer is: a) State Statistical Bureau.
The State Statistical Bureau is the primary agency responsible for conducting the Census in Arunachal Pradesh. It is a government agency under the Department of Planning of the Government of Arunachal Pradesh. The Bureau is responsible for collecting, compiling, analyzing, and publishing statistical data on the state. It also provides statistical services to the government and the public.
The Directorate of Census Operations is a central government agency responsible for conducting the Census in India. It is under the Ministry of Home Affairs. The Directorate is responsible for planning, organizing, and conducting the Census. It also publishes the results of the Census.
The Department of Planning is a government agency under the Government of Arunachal Pradesh. It is responsible for planning and development of the state. The Department does not have any role in conducting the Census.
The Election Commission of India is an independent constitutional body responsible for conducting elections in India. It does not have any role in conducting the Census.