The correct answer is: b) Registrar General & Census Commissioner.
The Registrar General & Census Commissioner is the head of the Office of the Registrar General and Census Commissioner of India, which is responsible for conducting the Census of India. The Census of India is a decennial census of the population of India. It is the largest peacetime operation in India, and is one of the largest censuses in the world. The first Census of India was conducted in 1872. The Census of India is used to collect data on the population of India, including age, sex, religion, language, literacy, and occupation. The data collected by the Census of India is used to plan for the development of India.
The other options are incorrect because:
- NITI Aayog is a policy think tank of the Government of India. It was set up in 2015 to replace the Planning Commission of India.
- The Ministry of Home Affairs is the ministry of the Government of India that is responsible for internal security, law and order, and border management.
- The National Sample Survey Office is an agency of the Government of India that is responsible for conducting sample surveys.