HELP I WILL GIVE BRAINLIEST WHO ANSWERS FIRST

How did trade play a role in the downfall of the Mongol Empire?

A. People wanted access to goods that were banned in the Mongol Empire.
B. Merchants brought in people from other nations who wanted to end the Mongol Empire.
C. Businesses failed, and trade slowed down so much that people left the Mongol Empire.
D. Trade networks carried the bubonic plague around the Mongol Empire and killed millions of people.