Population growth is an issue because

A. Infrastructure within cities is insufficient

B. Sociologists cannot track all the social groups that arise.

C. Natural resources are limited

D. It goes hand in hand with lowered life expectancy

The answer is C. Natural sources are limited. People tend to get their resources from the environment in order to live and survive. Because of the increasing number of human population, resources become scarce and there is not enough supply for consumption in the near future.