the answer is C. Right to peacefully assemble. because the first Amendment states that " congress shall make no Law respecting establishment of religion, or prohibiting the free exercise" which is talking about freedom of speech and freedom of religion BTW B. is talking about the 2nd Amendment.
I think it would be right to peacefully assemble because we mostly know the first amendment is right to speech, religion, etc., but with the right to speech you could peacefully "speak" your opinion.
