The correct option is B 1921
1921 was known as the 'Year of great divide' with regard to population growth in India. Prior to 1921, population was either not growing or growing at a very low rate. The main factor underlying the slow growth rate and decline were the recurrence of epidemics of plague and cholera and of famines. Between 1921-1951, the average annual growth rate of population was 1.2 per cent as against 0.2 per cent during the period 1900-21.