Read the statement below. Some natural resources can be replaced once they are used.

Which sentence from the article provides the BEST support for the statement above?

A. However, though air is limitless in supply, air quality is a problem in many parts of the world because of pollution.
B. Getting enough fresh water is a serious problem in many places.
C. Normally living things replace themselves through reproduction.
D. But such human activities as hunting, logging, building and polluting can cause whole groups of living things to disappear forever.