The answer is: A - Archeology
Explanation:
Archaeology is the study of the ancient and recent human past through material remains.
It is, or course, a probability. Space has many surprises, in fact, an Ateroid nearly hit earth recently. But, in all seriousness, it most likely will be a very long time before that ever happens.
In general, farmers faired very poorly during the Great Depression, since consumption of food lowered and deflation caused the price of crops to fall. The main environmental issue they face is drought.
They where big trading cities that many people wanted to control and because of it geographic location it was used as a cultural hearth
