Respuesta :
Answer:
C Their contributions and innovations made modern cities possible.
Explanation:
Fredrick Olmstead, Eisha Otis, Lous Sullivan, and John Robling all contributed to make modern cities possible. Parks, Skyscrapers, and chunks of cities woould vanish if they didnt contribute to the innovations they made to help people. Not only that, you probably would still be using ladders instead of elevators!