Dramatic irony is shown when the characters behave in a very demure way, using codes that reveal their curiosity and involvement with themes that are very inappropriate for the situation.
We can arrive at this answer because:
In this case, the author used dramatic irony to show how these three characters are not demure and naive, as they show themselves. They pretend to be naive, not to be judged by society, but they have many inappropriate thoughts, which are kept to themselves.
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