C is willing to let both of the authoritarian scumbags express their ideas. He values debate and free exchange of idea. He is reminiscent of the Founding Fathers. He is likely the leader of the group. This is the choice that supports freedom of speech.
A is says he supports an ideology that will ultimately "limit free speech" (whatever that means) if given political power. He has stated his point of view, and stated a hypothetical scenario in which a party he supports might limit speech somehow. He has not threatened anyone. He has not coerced anyone. Even his ideology that "limits free speech" is vague. This is the second best choice.
B has given a direct order to A to not speak. He will of course tell C to "shut the fuck up" too, because C's refusal to censor A is "tantamount to violence," or some nonsense like that. B is a self-righteous prick. He is the worst choice by a county mile.