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Question 20- Basic Mathematics
Democracy and capitalism is the answer.
Marxism is the belief that there should be no government, currency, and that property should be owned by the working class (to put it incredibly simply). It features equality and no capitalist manipulation by the upper class.
Socialism features government control over trade (in Marxism, "a dictatorship of the proletariat"), so no.
That leaves one choice. The American Dream is basically "get rich no matter the cost."
Im not sure exactly what your looking for but it may be something on the lines of: Historians base interpretations of past events on first hand sources which consist of diaries and writing or recordings of people who were at the event. A long with other sources such as newspapers.
There are no selections? The political problems that contributed to the fall of the western Roman Empire are the constant assasinations of emperors and the corrupted politicians, mercenaries, and enemies that made the political allies unstable and not in the least bit interested in protecting the Roman Empire from future attacks.
The answer would be, "B", "Law enforcement eavesdrops on telephone calls made from private phone homes". This is EXTREMELY illegal to do.