Why was the slik road closed during the tang and song dynasty?

B

Explanation:

There were no merchants on the road, and the towns along the route lost their usual bustle, which undoubtedly led to the decline of the silk road. By the time of the Song dynasty, another ethnic minority broke the silence of the silk road once again.

answer; i believe that the correct answer is (d); // supercontinent

if you are on the computer you can not take a picture but you can upload one but i am not sure about phones but i'm pretty sure it's the but to upload one just click the paper clip looking thing/ link thingy thing and upload a pic