The correct answer is: B) Every 10 years.
The Census of India is a decennial (every 10 years) census of India. It is conducted by the Office of the Registrar General and Census Commissioner, India, under the Ministry of Home Affairs. The first census was conducted in 1872, and the most recent census was conducted in 2021.
The census collects data on the population of India, including age, sex, religion, language, literacy, and occupation. The data is used to plan for the development of the country and to ensure that all citizens have access to essential services.
The census is a large and complex undertaking, and it requires the cooperation of millions of people. The data collected by the census is essential for understanding the changing demographics of India and for planning for the future of the country.
The other options are incorrect because they are not the frequency with which the Census of India is conducted. Option A is incorrect because the census is not conducted every 5 years. Option C is incorrect because the census is not conducted every 15 years. Option D is incorrect because the census is not conducted every 20 years.