Critique is the assessment and analysis of some theory. The critique of the central idea explains that everyone in Utopia is treated unequally.
A central idea is a unifying or the central matter of the topic that unifies the elements of the story or the plot by the author. It gives the idea of the plot in a literary work.
In the passage, the central idea is to portray the inequality between the citizens of Utopia. The inequality is based on slavery. The enslaved people were discriminated against and were not given equal rights.
Therefore, option C. slavery depicts the unequal treatment of Utopian people.
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