The correct answer is: a) Less than 10%.
Odisha’s population growth rate in the last decade (as per the latest census) is 9.7%. This is lower than the national average of 12.8%. The decline in population growth rate is attributed to a number of factors, including a decline in fertility rates, an increase in the number of people living in urban areas, and an increase in the number of people who are above the age of 60.
Option b) is incorrect because the population growth rate of Odisha is less than 10%.
Option c) is incorrect because the population growth rate of Odisha is less than 15%.
Option d) is incorrect because the population growth rate of Odisha is less than 20%.