American Cities Increasingly Abandoned Wooden Construction for Brick and Steel

American cities increasingly abandoned wooden construction for brick and steel in their downtown districts after

A) the great Chicago fire of 1871.
B) the development of the electric elevator and the skyscraper.
C) brickmaking became cheaper and iron was superseded by more durable steel for construction purposes.
D) the cost of brick and steel dropped markedly in the 1870s.
E) wooden tenements collapsed in the New York inner city in the 1880s.