(E) says, "By what means can Native Americans establish their rights to land on which their ancestors are buried?"
The first paragraph of the passage discusses how Native Americans can establish standing; however, the rest of the passage goes into detail about how graves are actually protected once standing has been established. (E) leaves this detail out. Additionally, (E) also fails to focus on the items buried within the land, instead of focusing on the land itself. This is why (E) is wrong.
(C) says, "In what ways does the law protect the rights of Native Americans in regard to the contents of ancestral graves?"
The purpose of the whole passage was to discuss how the law actually protects Native Americans' rights with regard to ancestral graves, and this is precisely the question that (C) gives us, so it's the right answer.
Does this answer your question? Let us know if you'd like any more clarification!
