Which political system allows only one ideology for the state?

Step 1: Analyze the question The question asks which system permits only ONE ideology for the state. This points to a system where the state imposes a single guiding doctrine and discourages or bans competing ideas.

Step 2: Explain the concepts

• Socialism: The state (or community) owns and controls the major means of production. In its practical forms, especially in one-party socialist states such as the former USSR, China, and Cuba, a single official ideology (Marxism-Leninism) guides the state and no rival ideologies are tolerated.
• Aristocracy: Rule by a privileged noble class or "the best." It is about who rules, not about a single state ideology.
• Communalism: A system of communal living and shared ownership in traditional societies. It is a social arrangement and does not impose one state ideology.
• Capitalism: Private ownership of production and free-market competition. It supports pluralism and a variety of ideas, so it does not restrict the state to one ideology.

Step 3: Eliminate options

• B is about a ruling class, not an ideology, so it is out.
• C is a traditional way of life, so it is out.
• D encourages freedom of choice and multiple ideas, so it is out.
• A is the system that in practice is tied to a single official state ideology.

Step 4: Answer The correct option is A. socialism.

Note: The question is somewhat loosely worded. Strictly speaking, socialism is an economic and political ideology, and one-party rule is what enforces a single ideology. Among the options given, though, socialism is clearly the best fit.

Exam tip: When you see "only one ideology" or "one-party state," think of socialism, communism, or totalitarian systems. When you see "free market" or "private ownership," think capitalism.