Final answer:
The National Origins Act of 1924 adjusted to 2% quotas and the 1890 census to limit immigration from Southern and Central Europe.
Step-by-step explanation:
The act that adjusted to 2% quotas and the 1890 census was The National Origins Act of 1924 (C).
This act aimed to limit immigration from Southern and Central Europe by establishing quotas based on the national origins of immigrants listed in the 1890 census. It effectively restricted immigration of groups such as Jews, Italians, Czechs, Poles, Russians, and other European immigrants.
The act also indirectly banned immigration of Asians by its provision against any group ineligible for citizenship.