In confucianism four-class system which group sat at the top of the hierarchy a. nobilityb. merchants c. presentsd. scholars

In Confucianism four-class system the nobles sat at the top of the hierarchy. So the answer is nobility.

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.