Answer: C) Nora decides that her decisions to be a wife and raise children were wrong, so she is leaving in order to educate herself properly.
In this excerpt, Nora informs Helmer of her decision to leave him. She feels that she cannot do a good job at the tasks that have been assigned to her: being a mother and a wife. Nora argues that she is not fit to the task because she lacks proper education, and she wants to first take care of herself and educate herself. This shows that she believes her decisions to have been wrong, and she wants to leave and educate herself properly.