What statement BEST describes how the Mongol Empire affected relationships between Europe and Asia?

Responses
A The Mongol Empire heightened the tensions between Europe and Asia contributing to more conflict.The Mongol Empire heightened the tensions between Europe and Asia contributing to more conflict.
B The Mongol Empire further separated these areas making them more isolated from one another than ever before.The Mongol Empire further separated these areas making them more isolated from one another than ever before.
C The Mongol Empire made trade and travel safe. This encouraged the cross-cultural spread of ideas, religions, and goods.The Mongol Empire made trade and travel safe. This encouraged the cross-cultural spread of ideas, religions, and goods.
D The Mongol Empire contributed to the merging of cultural traditions between Europe and Asia. As a whole the two cultures became merged.The Mongol Empire contributed to the merging of cultural traditions between Europe and Asia. As a whole the two cultures became merged.

C The Mongol Empire made trade and travel safe. This encouraged the cross-cultural spread of ideas, religions, and goods.