Why did the silk road open up under the Mongolian Empire?
A. They valued trade
B. They taxed trade
C. It was safe
D. all of the above
![Why did the silk road open up under the Mongolian Empire A They valued trade B They taxed trade C It was safe D all of the above class=](https://us-static.z-dn.net/files/dd4/212d1aab0f3bd4f4d79266ea6c9142b2.png)