A

The correct answer is D (very high population growth) because in developing countries, high population growth is one of the most often occurring issues.

Explanation:

Answer A is not an issue at all, while real facts do not justify answer B.

Answer C may seem correct, but often there is no shortage of resources but rather a lack of ability to use or develop them.

Therefore, overpopulation becomes one of the main concerns of developing countries. Furthermore, together with a low GDP per capita, the created population is forced to live in poverty even in urban areas. Other contributing factors, such as weak economic growth, government corruption, and lack of trade, create environmental circumstances that produce the biggest issues for the sustainable development of such countries.

The Future of Population Growth on Different Continents.
The Future of Population Growth on Different Continents (https://www.researchgate.net).