The correct answer is that the Supreme Court, in Buckley v. Valeo, ruled that limits on election spending are unconstitutional as campaign spending is an expression of speech that is protected by the 1st Amendment.
I believe the answer you're looking for is D.
Poorly. There was already a lot of unrest because US citizens believed immigrants were stealing their jobs. As more and more came, they grew more and more bitter. Plus everyone was basically racist back then, and the KKK had a much stronger political influence. They were thought of as second-rate citizens.