Which conclusion does this excerpt most clearly support? Hon. William Williams, Commissioner at New York, says in his report: "[The present laws) do not reach a large body of immigrants who, while not of this class, are yet generally undesirable, because unintelligent, of low vitality, of poor physique, able to perform only the cheapest kind of manual labor, desirous of locating almost exclusively in the cities, by their competition tending to reduce the standard of living of the American wageworker, and unfitted mentally or morally for good citizenship. ... Their coming has been of benefit chiefly, if not only, to the transportation companies which brought them here."

A. Americanization efforts among immigrants in the late 1800s quelled discontent
B. Immigration restrictions in the early 20th century induced job growth
C. Nativist sentiment was on the rise at the turn of the century.
D. Industrialization spurred demand for immigration in the late 19th century