I would go with option B. Formally explain something important. It seemed to me that he was trying to get his point across, while still having a respectful attitude. I hope I could help!
It helps readers feel as though they’re sharing your experience
I have read the excerpt from John F. Kennedy's 1961 Inaugural Address and how this excerpt shows parallelism is that, each paragraph contains a warning and a pledge. He also makes use of repetition "Let both sides" and this conveys unity in his inaugural speech. Answer for this is the second option.
Explanation: A hope this helps