The correct option is A Anarchist
An anarchist is a person who believes in or tries to bring about anarchy, that is, an anti-authoritarian political philosophy that rejects hierarchies deemed unjust and advocates their replacement with self-managed, self-governed societies based on voluntary, cooperative institutions. For example, "an anarchist newspaper". Hence, Option A is correct. Among the rest of the options, belligerent means hostile and aggressive., iconoclast means a person who attacks or criticizes cherished beliefs or institutions, agnostic means a person who believes that nothing is known or can be known of the existence or nature of God.These do not express this meaning, hence incorrect.