The statment that best describes the conflict is "Nora has forged her father's name on the loan she received from Krogstad, and he is threatening to expose her to Helmer. "
Explanation: In "A Doll's House" by Henrik Ibsen, Krogstad states that he has the contract that contains Nora's father's signature, which she forged in order to take out an illegal loan. Nora is under great stress due to being blackmailed by Krogstad, he demands for her to stop her husband from firing him from the bank.