The US Supreme Court Is the Highest Judicial Body in the the Nation

The U.S. Supreme Court is the highest judicial body in the nation. In regard to states, why is this important?

A) It allows for the federal courts to take over the state courts when the states fail to act properly.
B) It gives the Supreme Court the authority to settle disputes between states, such as ownership of or jurisdiction over disputed property.
C) It allows Congress to pass laws that will control states that have gotten out of control.
D) It gives the nation a place to determine the winner of an election.
E) It takes power away from a potentially abusive Congress.