Possibly because they wanted their jobs back. Back in the day, employers hired and underpaid immigrants and therefore firing white people that were paid more. Since immigrants accepted less pay, for the same work done by a white person, white people wanted the immigrants to be fired so they could get their jobs back.
The correct answer from the choices given will be Beliefs. Beliefs are acceptance, perception, and conclusion. These are all beliefs that a person is responsible for. The correct answer is B.
Well for reading the passage I will say the answer is (A).