Brinkmanship was a method of negotiation developed by President Eisenhower's Secretary of State John Foster Dulles.
The best option from the list would be that "Public transportation made it possible for factory owners to live in parts of a city that immigrants could not afford," since the immigrant workers during this time were paid very little money and often lived in terrible conditions.
I am pretty sure the answer is true but I haven't really researched this topic so I couldn't say it's definitely true
