Since you provide no picture , In the past, mongols was able to conquer almost all part of Asia and some part of eastern Europe.
So here are some territories that mongols did not conquer :
- Western Europe, such as France and England
- South East Asia , such as malaysia , Indonesia, Thailand
- Africa , such as Egypt
It's B. The Columbian Exchange is just that, the exchange of goods, plants, people, etc. between Europe and the Americas
The answers are B, C, and D
