The majority of immigrants and rural migrants who moved to american cities at the turn of the twentieth century became part of

a. middle class.
b. working poor.
c. wealthy class.
d. working rich.

I believe the answer is: working poor

Working poor refers to the group of people who are in poverty level due to lack of work hours/opportunity. The majority of immigrants came to American cities to gamble their opportunities and hope that they managed to get job in recently established manufacture companies. Only some of them able to got the jobs.

in his book, the riddle of the rosetta stone, james giblin talks about how there was a young british polymath and physician named thomas young who made a lot of advances on the deciphering of the rosetta stone. he says that even though young made a lot of mistakes because he was working under false assumptions, he also made huge contributions like deciphering three out of the seven symbols (more than anyone else before him). young published his findings and continued his good work but he wasn't able to progress much further due to some unfavorable situations, he still laid the basis for many other scholars and of course for the man who has been generally known to have deciphered it, jean-françois champollion

that would be the steamboat because none of the other things are forms of transportation