Irony in literature involves contrasting appearance and reality. The best example of irony among the given situations is the politician titling his speech about homelessness 'Unacceptable Norms.'
Irony is a literary device where there is a contrast between appearance and reality. In the context of the question, situation C is the best example of irony. The politician titling his speech about homelessness in America as 'Unacceptable Norms' creates a contradictory and ironic situation where the content of the speech is at odds with the title.
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