One of the Most Troublesome, Unintended Consequences of the Growth

One of the most troublesome, unintended consequences of the growth of urban populations at the turn of the century was the

A) drastically decreasing number of immigrants overall in the United States.
B) end of the "Realist" movement in art and literature and rise of the "Romantic" movement.
C) decline of vaudeville shows as a form of public entertainment.
D) growth of disease from the lack of sanitation in crowded city neighborhoods.
E) lack of what one scientist called "a mania for facts."