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

A. NORA. Yes, but, nurse, I shall not be able to be so much with them now as I was before.
B. 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?
C. 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.
D. NORA (putting her arms round her neck). Dear old Anne, you were a good mother to me when I was little.
E. 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.)

B. 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?