According to the passage, which one of the following is true of cases involving ancient graves? A. Once a plaintiff's standing has been established, such cases are usually more difficult to resolve than are cases involving more recent graves. B. The distinction between individual and communal property is usually an issue in such cases. C. Even when a plaintiff's standing has been established, property law cannot be used as a basis for the claims of Native Americans in most such cases. D. In most such cases, common law does not currently provide a clear basis for establishing that Native Americans have standing. E. Common law is rarely used as a basis for the claims of Native Americans who have established standing in such cases.