Better ships were available so why would they want to.
Generally speaking, "assembly line jobs" did not represent an obstacle during this time, since this in fact increased productivity through the "specialization of labor".
Answer:
C. Japanese immigrants
Explanation:
Like most of the American population, Japanese immigrants came to the U.S. in search of a better life. Some planned to stay and build families in the United States, while others wanted to save money from working stateside to better themselves in the country from which they had come.