The author thinks that, overall, the world is growing better.
What is one piece of evidence he gives to support this idea?
A
He says that the poor live in tenements only because they have no better homes.
B
He says that Italian rag-pickers are moving up to control corner fruit stands.
C
He says that a map of New York would have more colors than any rainbow.
D
He says that one immigrant group after another keeps coming to New York.