In the US, the Only Legal Prohibitions Against Hate Speech

In the US, the only legal prohibitions against hate speech concern speech that _______________.?

A) contains a serious and imminent threat of violence against identifiable persons or directly incites others commit specific criminal acts against those person
B) creates a general atmosphere which encourages extremists to commit acts of violence against marginalized populations
C) which targets racial populations protected under the Fourteenth Amendment of the Constitution.
D) trick question: there are no limits on hate speech in the US due to the protections provided by the First Amendment.