In the early 14th century, the agricultural economy in europe had begun to:
a. fail due to papal restrictions on monastic houses.
b. fail due to climate change and excessive cultivation.
c. regain levels achieved in the late roman empire.
d. improve due to rising average temperatures."

B) fail due to climate change and excessive cultivation.

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.

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