The Silk Road played the largest role in Buddhism's spread throughout Asia from the 100s to the 700s CE.
Explanation:
In the early first and second century Silk Road was used by Buddhism to reach Han China. The invasion of China by Buddhism happened through this Silk road. The religion which was new was preached by the monks of Buddhist through their Silk Road travel.
In that way, Buddhism was preached to China with Silk Road which was in first century. In the seventh century, the travel of Buddhism via silk road came to an end. This happened because here was an increased spreading of the religion Islam in the Central Asia.
