China instituted a one-child policy in 1979 because overpopulation resulted in limited space and resources.
China's one-child policy
The one-child policy was a program presented by the China government to limit the population by having one child.
The policy addressed the growth rate of the country's population, which began to grow too rapidly.
Overpopulation would create less area and resources for people, which would increase the extraction from the environment.
Thus option D is the correct answer.
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