The correct answer is religious persecution and here's why:
The Mongol rule occurred at the same time but was not as important as religious persecution. Muslim rule was common earlier during the 6th century, while intellectual oppression was not a recurring issue.
The correct answer is 3) a polytheistic mythology
Hope this helps
Predators, floods, fires, droughts, sickness, etc
One of the reasons why the Roman Empire produced more coins is because the Empire was constantly expanding and they needed to more money in circulation. Another reason was that people would chip the sides off the coins.