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:

Elevated trains run above streets and subways run underground, so they carry passengers without adding to surface street congestion. The other options are incorrect: horses/carriages are pre-mass transit, automobiles remained common, and these transit systems focus on passenger transport, not food delivery.

Answer:

C. by transporting commuters without crowding city streets