Which of these most facilitated the spread of the bubonic plague from China west?

Question

Quizplus · Accepted Answer

The Pax Mongolica, which refers to the period of stability and increased communication brought about by the Mongol Empire, facilitated the spread of the bubonic plague from China westward. The Mongols created new trade routes and facilitated the movement of people and goods, allowing the disease to spread more quickly and over greater distances. Mongol armies and traders also unwittingly carried the disease with them, spreading it to new populations along their routes of travel.

Which of These Most Facilitated the Spread of the Bubonic