How did the role of historical events in the late 1800s to early 1900s play a role in the development of realism and naturalism in literature?

Which evidence supports the inference that nora is afraid of what torvald will say if krogstad tells him about her forgery? do it for my sake—for your own sake—for the children's sake." "you don't know what that letter can bring upon us." "yes, it's too late." "you will never have to do that."