If this question regards the rapid population growth of HUMANS in a region, then I believe the most plausible answer would be D.
It is highly unlikely that natural environments such as forest land would be expanded, in actuality this land area would decrease, as a result of people building and developing on these areas. This is due to more room being needed as a result of the sudden rise in population.
Well a crescent is shaped like the letter C so its probably C
A) a form of socialism based on sharing
