Answer:
B) fail due to climate change and excessive cultivation.
Step-by-step explanation:
Many problems that modern civilization is currently facing where also a problem hundreds of years ago. An example of this is that excessive agriculture during the middle ages in Europe lead to the reduction of forests (which lowered rain levels) and the wear out of soil which eventually ended up reducing the amount of crops and hurting local economies. That lead to an increase in the amount of poor farmers that left the countryside and moved into larger cities.