Answer:
A. It encouraged European nations to attack China
Explanation:
Silk Road was a huge trade network that connects East Asia and Southeast Asia and Southern Europe through land and sea route.
Silk road helped Rome and Han China to expand greatly as they were ruling the trade over silk road through new ideas for the trading of silk and other goods. The power of silk road and its importance in business or trading encouraged European nations to attack China and use the power for their benefit as well.
Hence, the correct answer is "A. It encouraged European nations to attack China".