Answer: A) The Pax Mongolica
Explanation:
The 13th and 14th centuries saw the rise of a new power, the Mongols. Under Genghis Khan they conquered most of Asia and some part of Eastern Europe.
In these conquered areas, the Mongols established a peace and security that few would have thought possible at the time.
This period was known as the Pax Mongolica and allowed for the trade of goods and exchange of ideas from Asia to Europe including religion, exotic goods and Chinese inventions.