The correct answer is A) strength of opposition parties.
Communism and fascism differ as political systems in the strength of opposition parties.
Communist try to abolish private property. Their aim is the end of Capitalism. However, there are political parties that represent a certain kind of opposition to the party in power. Fascism represents a totalitarian government in which liberties are suppressed and the state has total control of politics and the economy. This fascist nations usually have a dictator on power and they use the military to suppress free press and freedom of speech.