How does the persona reply to the second question​

Select the sentence with an appositive phrase and a relative pronoun.

What do mcmahon’s references to thomas carlyle and john stuart mill do for his own image and credibility?

"as one of our outstanding historical figures once said, ‘when a great democracy is destroyed, it will not be because of enemies from without but rather because of enemies from within.’" (paragraph 7) how does this quote reveal mccarthy’s point of view and advance the purpose of his speech?