Question

teks (us.27.a)
urban mass transit vehicles, new york city, 1869 - present
elevated train
train that ran on aboveground tracks
1869 - 1973
cable car
streetcar operated by underground steam - driven cable conduits
1883 - 1909
trolley
streetcar operated by overhead or underground electrical power
1887 - 1957
subway
train that runs on underground tracks
1904 - present
courtesy of the new york transit museum
how did these developments in transportation most affect the standard of living in u.s cities?
by increasing traffic congestion on city streets
by giving residents more flexibility in employment
by increasing the expenses associated with relocation
by expanding the options for personal education

Explanation:

Urban mass transit vehicles like elevated trains, cable cars, trolleys, and subways improved transportation. This means people could travel more easily. With better transportation, residents had more flexibility in choosing jobs as they could commute to different areas. Traffic congestion might be reduced (not increased) as mass transit can carry more people. Relocation expenses are not directly related to these transit developments in a positive way for standard of living. And while education options could be affected indirectly, the most direct and significant impact is on employment flexibility.

Answer:

By giving residents more flexibility in employment.