I believe the answer is A. Representative Democracy
Aristocracy is a government that puts its power into a handful of privileged people
Absolute Monarchy is a form of Monarchy that isn't restricted by written laws and rules itself in a way
Military Dictatorship is exactly what it sounds like...the military is the government, it creates the laws, enforces them. The Dictator is usually the highest ranking.
And finally a Representative Democracy is a Government that gets its power from the people and is ruled by representation