Correct option is D
The correct answer is (d) 1951 - 1981.
• The period from 1951 to 1981 is known as the period of population explosion in India.
• This era witnessed a rapid increase in the population due to several factors, including a significant decline in mortality rates owing to improvements in healthcare and sanitation.
• During this period, the birth rate remained relatively high, and the death rate decreased, leading to a high natural growth rate.
• This population boom had significant social and economic implications, prompting the government to implement various family planning and population control measures.
Information Booster:
• 1981 - 2021: This period includes recent years where India has seen continued population growth, but not the sharp explosion seen in the mid-20th century.
• 1931 - 1961: While this period saw substantial population growth, the most dramatic increase occurred between 1951 and 1981.
• 1921 - 1951: This period marked the beginning of the population growth phase but was not as explosive as the subsequent decades.