The decadal growth rate of India's population as per Census 2011 is __________.

Correct option is C

The correct answer is (c) 17.64%
As per the Census of India 2011, the decadal growth rate of India's population from 2001 to 2011 was 17.64%. This rate indicates the percentage increase in the population over the decade. It is a measure of how fast the population grows in a specific period and is used to assess changes in the population's size and structure. This growth rate marked a slight decrease from the previous decade (1991-2001), which had a growth rate of 21.54%, reflecting a gradual slowing down in the population growth rate of India.