The early 20th century was an era of business expansion and progressive reform in the United States. The progressives, as they called themselves, worked to make American society a better and safer place in which to live. ... This generation of Americans also hoped to make the world a more democratic place.
I believe the answer is D. The Jungle is full of pictures and descriptions of the streets and homes during the 60s that were so utterly polluted by society. Hope it helped!
