Question

how did elevated trains and subways improve urban transportation?
by using horses and carriages to commute
by making the automobile unnecessary
by transporting commuters without crowding city streets
by delivering fresh food to people in cities

Explanation:

To determine the correct answer, we analyze each option:

• "by using horses and carriages to commute": Elevated trains and subways don't use horses/carriages, so this is incorrect.
• "by making the automobile unnecessary": They didn't make automobiles unnecessary, so this is wrong.
• "by transporting commuters without crowding city streets": Elevated trains (above - ground) and subways (under - ground) carry commuters without taking up space on city streets, which is a key way they improved urban transport.
• "by delivering fresh food to people in cities": Their main function is transporting people, not delivering food, so this is incorrect.

Answer:

C. by transporting commuters without crowding city streets