"The judicial power shall extend to all cases, in law and equity, arising under this Constitution, the laws of the United States, and treaties made, or which shall be made, under their authority;--to controversies between two or more states;--between a state and citizens of another state;--between citizens of different states; - between citizens of the same state claiming lands under grants of different states, and between a state, or the citizens thereof, and foreign states, citizens or subjects."
- excerpt from the Constitution of the United States, Article 3, Section 2
According to the Constitution who has the power to judge a case between citizens of two different states?

A) Congress
B) President
C) state courts
D) Supreme Court