Answer:
B) China
Step-by-step explanation:
The Chinese were effectively barred from entering the U.S. by the Chinese Exclusion Act of 1882, a U.S. Federal Law.
The Chinese were subject to this ban because of they had previously immigrated in large numbers, especially to California, drawn by the Californian Gold Rush of 1848-1855.
At fist, the Chinese were well received because they provided cheap labor in the mines, and later, in the railways. However, as gold became more scarce, and the economy cooled down, Chinese immigrants became to be seen as the culprit for the depressed wages and harder economic conditions.
This anti-Chinese sentiment was capitalized by local Californian labor leaders and politicians, and ended in the proclamation of the Chinese Exclusion Act.
The Act was only derogated in 1952 by the Immigration and Nationality Act.