Which one of the following best expresses the main idea of the passage? A. Prior to an appellate court's ruling in Charrier v. Bell, Native Americans had no legal grounds for demanding the return of artifacts excavated from ancient graves. B. Property law offers the most promising remedies to Native Americans seeking to recover communally owned artifacts that were sold to museums without tribal authorization. C. The older the grave, the more difficult it is for Native Americans to establish standing in cases concerning the disposition of archaeologically excavated ancestral remains. D. In cases in which Native Americans can establish standing, common law can be useful in protecting ancestral remains and the artifacts buried with them. E. Native Americans are unlikely to make significant progress in the recovery of cultural property until common law is significantly expanded to provide them with standing in cases involving the excavation of ancient graves.