How did city commuting change beginning in the late 1800s?

I believe the answer is A "Elevated trains and subways replaced horse-drawn trolleys"

Just think, why was it effective? -it appeled to critics because it was written well, that made it noticeable to the public including the white population-it was also recognizable to the african americans because it was about their heritage.-it was powerful just keep finding more points and elaborate on them. message me if you need more