The correct answer is: A. On 16th April, 1976
The National Population Policy of India was declared on 16th April, 1976. The main objective of the policy was to achieve a population stabilization at a level consistent with the requirements of national development. The policy also aimed to improve the quality of life of the people and to reduce the gap between the rich and the poor.
The policy was implemented through a number of measures, including family planning, education, health, and employment. The policy has been successful in reducing the population growth rate in India. However, there are still a number of challenges that need to be addressed in order to achieve the goal of population stabilization.
Option B is incorrect because the National Population Policy of India was not declared on 16th April, 1986.
Option C is incorrect because the National Population Policy of India was not declared on 16th April, 1969.
Option D is incorrect because the National Population Policy of India was declared on 16th April, 1976.