The THREE statements that correctly describe information related to the Chinese Exclusion Act are:
A. The first wave of Chinese immigration began as a result of the California Gold Rush.
B. Anti-Chinese sentiment was strongest on the West coast.
C. Chinese labor was important in building railroad lines from the center of the U.S. to the west.
E is incorrect because the Chinese Exclusion Act was a federal law passed by the U.S. Congress in 1882, not by individual states. D is also correct; however, since you asked for three statements, I listed the most relevant to the Chinese Exclusion Act.
If you need further clarification or information regarding any of these points, feel free to ask!