In a unitary government the central government holds all the power. In a federal government the power is divided between the central government and lower levels of government (provinces or states). In a confederate government most of the power rests in the states.'
Hope this helps :)
Its not A or C, and I don't think its B either so I'm pretty sure its D because I have never heard of U.S. District court. I just know for a fact that court of appeals and supreme court are part of the system. Superior court sounds familiar too. Its been a while since I took government, sorry.
The fifteenth Amendment of the United States Constitution granted African American males the right to vote by stating that an American citizen's rights could not be infringed upon on the basis of a man's race or a colour.
However, it is important to consider the fact that, although this amendment was passed, it was not heavily enforced and many African American men were still denied the right to vote, especially in southern states.