Answer:
To support an argument's claim.
Answer: Ahab has lost his sanity but is still determined to have his revenge.
Explanation:
The meaning of this excerpt is that Ahab has become totally crazy but this craziness fuels him to seek revenge. Inevitably,He has reached a point where he is as much a victim as he is an aggressor. The whale is the target of his fury and his mind is lost in the lunacy of his pursuit for revenge. He has reached a point of no return.
If I were you I would use direct quotes from the book or whatever you are reading. Direct quotes give evidence from the text and prove points. You may also use line numbers if instructed by your teachers.
I think the answer is C) Supporting details, I’m sorry if it’s wrong