Answer:
A. Nora realizes that she can no longer ask Doctor Rank for help because he is in love with her.
Step-by-step explanation:
Mrs. Linde has double-crossed her genuine romance, Krogstad, by wedding another man for cash and security, a demonstration which has abandoned her "vacant." And Dr. Rank isn't completely the benevolent companion to Torvald that he initially seems, by all accounts, to be: he visits since he is enamored with Nora.