<span>While he doesn't specifically mention slavery in this excerpt then I would say that the answer would be B) by citing the office to which he was elected as it could be said to be ethos as appealing to people's belief that the president has the right to declare war though the obvious purpose of the war is to fight slavery.</span>
The answer is A because it is the only sentence with a conjunction
A hook relating to love is painful can be: "Because every time I think of you is the happiest and the saddest moment of my day. I will never understand why loving you hurts so much"
In writing a hook is a brieft introduction that helps catching the readers attention. A hook can be a quote, a question or just some words that give the reader a clue about the topic of the text.