The correct option is B 1.21 billion
The Indian Census 2011 can be referred to as the seventh census operation after Indian independence. The national census 2011 has been run on all the 28 states of the country and the seven Union Territories. The data of Indian census 2011 covers all the major aspects of society like population , sex ratio and literacy percentage. The total population of the country is 1.21 billion presently.