Answer:
If this is MLA style, then it's B. The book's title is first instead of second.
Lincoln's House Divided Speech. ... A house divided against itself cannot stand. I believe this government cannot endure, permanently, half slave and half free. I do not expect the Union to be dissolved — I do not expect the house to fall — but I do expect it will cease to be divided.
You'll want to leave it out. if it isn't conducive to the content of your paper, it's more like a distraction from what you're trying to say. parentheses might be a "safe" way to signify a side topic, but it weakens the paper as a general statement because the reader has to pause and take a moment to absorb a new topic before going back to what you were saying
