The correct option is A 2011
Census is conducted every 10 years in India. The last census was conducted in the year 2011. The national census survey covered all the 28 states of the country and 7 Union territories including 640 districts, 497 cities, 5767 tehsils & over 6 lakh villages. As per the census of 2011, the population of India was 121 Crore.