In addition to local courts, the district of columbia also has
a. a district court
b. a military commission
c. a tax court
d. a civilian tribunal

The answer is District Court. The United States District Court for the District of is a centralized district court. Petitions from the District are going to go to the United States Court of Appeals for the District of Columbia Circuit excluding for patent rights and rights in contradiction of the U.S. government in the Tucker Act, which are enticed to the Federal Circuit.