Which of the following periods is referred to as a period of stagnant or stationary phase of growth of India's population?

Correct option is B

The correct answer is (b) 1901-1921
 This period is often referred to as the stagnant or stationary phase of growth of India's population because the growth rate was very low, even falling below 0% during the decade of 1911-1921.
 The Period of Steady Growth (1921-1951)
 The Period of Rapid High Growth (1951-1981)
 The Period of High Growth With Definite Signs of Slowing Down (1981-2011)
 A census occurs every 10 years in India.
 Father of Indian Census - Henry Walter.
 The first census was conducted by Lord Mayo in 1872.