The correct answer is: b) 10 years.
The Census of India is a decennial (ten-yearly) exercise conducted by the Government of India to count the population of India. The first census was conducted in 1872, and the most recent census was conducted in 2021. The census provides a wealth of information about the population of India, including its size, distribution, age structure, sex ratio, literacy rate, and religious composition. The data collected by the census is used to plan and implement development programs, and to monitor the progress of the country.
The census is conducted by the Office of the Registrar General and Census Commissioner, India, which is a part of the Ministry of Home Affairs. The census is a massive undertaking, and it requires the cooperation of millions of people, including government officials, enumerators, and volunteers. The census is also a very expensive exercise, and it costs the government billions of rupees to conduct.
The census has been criticized for a number of reasons, including its high cost, its intrusiveness, and its potential to be used for political purposes. However, the census remains an important tool for understanding the population of India, and it is likely to continue to be conducted every ten years.
The other options are incorrect because the Census of India is not conducted every 5 years, 15 years, or 20 years.