Why did most of the immigrants who came to america in the late 19th century settle in the cities?

a)
city living was spacious, clean, and far from overpopulated.

b)
city living was crowded but there were plenty of recreational activities.

c)
cities were the cheapest places to live and offered unskilled laborers steady jobs.

d)
people had a hard time finding work so they settled into the cities since they could not afford to move.