Why did the number of Chinese immigrants fall drastically in the late

Why did the number of Chinese immigrants fall drastically in the late nineteenth century?

a. Chinese laborers were treated so poorly in the West that fewer immigrants wanted to come to the United States.
b. China severely restricted immigration to the United States beginning in the 1880s.
c. The Homestead Act did not apply to Chinese immigrants and thus there was no land available for them.
d. Many Chinese laborers found better work in Europe than in the United States.
e. The Chinese Exclusion Act of 1882 suspended immigration of Chinese laborers.

ANSWER
E