The defense of Lady Bracknell advances the plot because A. It causes Jack to reveal that Algernon broke into jacks home by pretending to be his brother
This refers to the telling of a story, usually with the aid of a narrator to show the sequence of events that occurred in the story.
Hence, we can see that based on the accusation by Jack of Algernon, Lady Bracknell defends him and says he is an Oxonian, and this forces Jack to reveal that Algernon broke into jacks home by pretending to be his brother.
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