The correct answer is D) Congress has created specialized courts to deal with such cases.
Federal district courts do not try cases dealing with military matters, grievances against the government, or tax disputes because Congress has created specialized courts to deal with such cases.
The institution that deals with military cases is called the United States Court of Appeals for the Armed Forces. The court has five civilian judges appointed by the US President. They serve a 15-year term. This court reviews decisions from the Air Force, Army, Nacy, and Guard Coast Court of Criminal Appeals.