For Europeans,the Most Important Consequence of the Mongol Conquests Was

For Europeans,the most important consequence of the Mongol conquests was:

A) the commercial links it established between Europe and the Far East along the Silk Road.
B) that the Mongol defeats of the Abbasid caliphate removed a major threat to European control of the eastern Mediterranean.
C) that the Mongol conquest of Russia brought eastern Europe into closer contact with western Europe.
D) that by destroying Persia, the Mongols extended the life of the Byzantine Empire.
E) the extensive cultural exchange that became possible between the Chinese and Europeans.