I need help ASAP picture is attached it’s got a test please helpppppp

C. an economic boom in the West

Explanation:

the Chinese were attracted to the gold in California. they wanted to try their luck at the California gold rush

C)the Chinese constructed frontier forts garrisoned by multi-ethnic forces

Explanation:

As you can see in both maps, the ones that built roads and connected the whole empire were the Romans, in the Chinese map you can observe how they actually put their efforts in a different place cause they needed to defend themselves from foreign attacks and invasions, their priority was to protect the center of the empire so they built the great wall, so the answer would be C)the Chinese constructed frontier forts garrisoned by multi-ethnic forces