What is the main demographic reason for calling 1921 the year of great divide in India?

Correct answer: After it population growth trend moved clearly upward

Direct answer: Option A is correct. In the study of India’s population history, 1921 is called the year of the great divide because the long-term population trend changed around this point. Before 1921, population growth was slow and irregular, with periods of stagnation or decline. After 1921, the general trend became a more consistent increase, although the rate was not identical in every census period. This makes 1921 a demographic turning point, not a claim that population suddenly became infinite or that every later year had exactly the same rate. Option B is absurd because India’s population did not become zero. Option C is wrong because censuses continued after 1921. Option D is wrong because births did not end. Memory cue: “great divide” means a major change in the direction of the population trend, not a literal division of people.