if you are with k12 i just did the test and the answer is b) Master Hauchecorne, who is often deceitful, breaks down when people don't believe he is telling the truth.
I'd choose answer C.
Irony is a figure of speech in which the result of an action is expected to be totally opposite to the normal result. In this particular case , answer C is trying to make focus that the mayor is a fool and SUDDENLY he took a smart decision.
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