Generally speaking, after being an apprentice, a person would become a "journeyman," since this required a higher set of skills and expertise. This was not always the case, however.
Answer:
Hello There! I picked A. Not entirely sure. EDGE 2020.
<span>The nation's largest railroad center was found in Chicago. Chicago is considered as the most important center of railroads in North America. Chicago has been the most significant interchange point of commercial transportation between the nation’s great railroads.</span>