Which figure relates trend of population growth rate of India from 1951-2001?

Answer is option C
Period of 1951-61: is termed as population explosion period. High birth rate, low mortality rate and better health facilities were reason for this.
Period of 1961-71: growth rate of population was 24.8%
Period of 1971-81: growth rate of population was 25%
Period of 1981-91: growth rate of population was 25.3%
Period of 1991-2001: growth rate of population was 26.9%.
Population of India increased to 102.70 crore in 2001. The main reason for this tremendous rise in population in the last 50 years was fall in death rate, advanced medical facilities and no fall in birth rate. Hence, the concave shaped growth curve is obtained.