If California and Arizona Sue Each Other Over Water Usage

 If California and Arizona sue each other over water usage from the Colorado River,the case can be heard only 

A)  by the federal waters rights court. 
B)  by the Supreme Court. 
C)  by the high courts in both states. 
D)  by the U.S. Justice Department. 
E)  by a high court of a state not involved in the case.