To appeal to an audience that is against slavery.
hope it helps :)
B i think it is not 100% sure
Answer:
Frustration.
Explanation:
"Did he feel as if his dead brother were the rightful Vincent, the one who would remain perfect in his parents' hearts, and that he was merely an unsatisfactory replacement?"
Vincent's frustrated. He feels he doesn't fit in, or that he isn't good enough like his brother. I'm not great at wording things but, the answer is frustration.