challenge: According to the Taney Court's decision in United States v. Reid (1851), what is the scope of the Rules of Decision Act (RDA) in relation to state law?
  
  A. The RDA incorporates post-1789 changes in state law for both civil and criminal cases.
  B. The RDA applies only in criminal cases and adopts post-1789 changes in state law.
  C. The RDA does not apply to any cases involving state law.
  D. The RDA applies only in civil cases and incorporates post-1789 changes in state law.
  Answer: 