Improved economies allowed the wealthy to support artists.
individual
More Europeans were literate because of several things:
inca emporers always married their sisters
It's power was divided
Many of them show modern technology.
Levees
Which led most directly to the decline of the Latin language
An Internet search of the question found a possible answer could be that once the plague ended, it never returned to Europe.
Without seeing the multiple choices that were offered in the test, you could answer with almost anything.
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C. Respect for the Mongols