China instituted a "one child per couple" rule to help address overpopulation (Option D).
- China is a country that has an enormous population (around 1,4 billion people).
- The policy "one child per couple" was aimed at reducing the growth rate of China's population.
- This policy ("one child per couple") has been successful to reduce the rate of growth in the Chinese population.
In conclusion, China instituted a "one child per couple" rule to help address overpopulation (Option D).
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