Which forms of government are most associated with the united states
a)democratic, republican, federal, and presidential
b)democratic, republican, unitary, and parliamentary
c)democratic, monarchic, confederate, and anarchic
d) democratic, oligarchic, federal, and presidential

The correct answer is A. democratic, republican, federal, and presidential.
We have 2 main political groups in the U.S. The Republicans, and the Democrats. Knowing this, it must be an option with both of these in it. As we have a President instead of Lords/kings, we can exclude any that contain Parliamentary. Thus, the only answer left is A.