Which detail from this excerpt best foreshadows a tragic element to the end of A Doll’s House?

NORA. Yes, but, nurse, I shall not be able to be so much with them now as I was before.
NORA. Nurse, I want you to tell me something I have often wondered about—how could you have the heart to put your own child out among strangers?
NURSE. What, when I was going to get such a good place by it? A poor girl who has got into trouble should be glad to. Besides, that wicked man didn't do a single thing for me.
NORA (putting her arms round her neck). Dear old Anne, you were a good mother to me when I was little.
NURSE. I am sure there will be no one at the ball so charming as you, ma'am. (Goes into the room on the left.)

The detail that best foreshadows a tragic element to the end of A Doll's House is Nora's question about how the nurse could have the heart to put her own child out among strangers. This suggests themes of abandonment and the consequences of societal expectations, which could potentially lead to tragedy in the play.