The correct statement regarding the Mongols' impact on trade and the exchange of ideas during the Pax Mongolica is:
They established a network of trade routes and encouraged cultural exchange.
During the Pax Mongolica, which refers to the period of peace and stability across the Mongol Empire in the 13th and 14th centuries, the Mongols facilitated trade across a vast territory, including the Silk Road. They implemented policies that promoted safe passage for merchants, leading to increased trade and cultural exchange between different regions, such as Asia and Europe. This era saw the mingling of different cultures, ideas, and technologies, significantly influencing the societies involved.