Why did so-called nativists resist the influx of immigrants from Europ

Why did so-called nativists resist the influx of immigrants from Europe at this time?

a. There was a strong sense of resentment of Europeans due to American involvement in the First World War.
b. In general, nativist Americans tended to favor immigration from “native” Latin American countries rather than from Europe.
c. European immigrants were taking a large percentage of high-paying jobs, which angered citizens of the United States.
d. There was widespread concern that the influx of foreigners would deprive Americans of lower-paying but more abundant jobs.
e. Scientists had proven than European peoples were genetically inferior and therefore ought to be prevented from intermingling with American people.

ANSWER
D