What are two types of oligarchies?
theocracy and monarchy
dictatorship and theocracy
communism and dictatorship
theocracy and communism

First, you need to know what an oligarchy is. This term refers to a type of government where a country is ruled by a group of people. Next, you can use the system of elimination: A is incorrect because in a monarchy, there is only one ruler - the king/queen; B is incorrect because dictatorship means there is only one ruler - the dictator, which is why C is also incorrect. Which leaves us with D as the correct answer - theocracy means that priests rule in the name of God, and in communism, everything is shared, even the government. 

The right answer is D "Theocracy and Communism."