The conversation between Mrs. Linde and Nora affects the plot because D. It has a major impact, because it hints at the doctor's feelings for Nora and her attempt at manipulation.
In the text, Mrs. Linde suspects of Dr. Rank's intentions with Nora, and eventually warns her about her relationship with him. But Nora pretends he is not more important than just Helmer's Doctor, and tries to deviate the focus towards Helmer's jealously.
it has a major impact, because it hints at the doctor's feelings for Nora and her attempt at manipulation.
In Henrik Ibsen's "A Doll's House," the conversation between Nora and Mrs Linde suggests Dr Rank's feelings for Nora and her efforts to control him as a possible money point of supply to pay her debts. In fact, Mrs Linde actually believes Dr Rank has lent Nora the money to pay for Torvald's health treatment.
I believe that the answer is “ they aren’t sufficiently brief” because the irony is that he’s expected to make brief summaries so since they aren’t brief then that’s irony.