A, B, and C show the horrors of industrialization.
Industrialization included the building of many factories in cities. These factories were not clean and had no environmental protection rules to follow. They spewed out black soot all over the city making the city dark and dirty. In options A, B, and C this horrid blackness is described. Option A compares the soot covered town to a savage, which has an evil dangerous connotation. Option B compares the black smoke from the factories to a snake looming over the city never leaving. Option C talks of a polluted river full of the nastiness of the industries and factories that were built during Industrialization. All of these images show how industrialization has turned the town into a place crawling with black serpents, pollutants, and savages.