The first sentence. It shows that the brothers are willing to hurt their relationship and each other for power.
Answer:
Katherine's gradual perception of her family legacy and the growing presence of that legacy in her life
Supporting details can do all of the enlisted options except introduce the main idea. Supporting details are there to support the main idea, so of course they cannot introduce it. They are the result of the main idea, not its creator.
He is a studious college student
