Immigration policies no longer exist in the United States as national ethnic quotas. Thus the correct answer is A.
The movement of people from their birth location to another location in search of livelihood and better opportunities for growth and development indicates immigration.
The Immigration Act of 1924 set a national origins quota that restricted the number of immigrants who may enter the country. These consider as racial discrimination by the supreme court and will no longer exist.
Therefore, option A national ethnic quota is appropriate.
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