Which evidence from the text supports the prediction that Helmer learn the contents of the letter select three options

This question concerns Act 2 of the play "A Doll's House". I've found the options online. They are the following:

What evidence from the text supports the prediction that Helmer will learn the contents of the letter? Select three options.

Helmer knows that there is a piece of mail from Krogstad in the box.

Nora looks at her watch and tells herself she has 31 hours to live.

Helmer thinks that Nora is nervous and dismisses her pleas about the mail.

Mrs. Linde fails to find Krogstad so he can take back the piece of mail.

Nora expresses her intention of having a champagne banquet.

The three correct options are:

A. Helmer knows that there is a piece of mail from Krogstad in the box.

C. Helmer thinks that Nora is nervous and dismisses her pleas about the mail.

D. Mrs. Linde fails to find Krogstad so he can take back the piece of mail.

Explanation:

“A Doll’s House” is a play by Henrik Ibsen that was quite scandalous for addressing and criticizing the way women were treated and seen not only by society, but also by their own families. Nora, the main character in the play, is being blackmailed. She once took a loan from the very bank where her husband, Torvald Helmer, works without his knowledge. Since women were not allowed to do such thing, she forged her father’s signature. Now, her husband wants to fire Krogstad, an employee of the bank. But Krogstad is threatening Nora, demanding that she get her husband to take him back lest he reveals the truth about her loan.

In Act 2, Nora is desperate because she knows there is a letter from Krogstad to her husband in the letter box, and so does Helmer. She pleads with him to not read any mail until after a party the next day, but her husband thinks she is acting this way out of nervousness, and dismisses her pleas. To make matters worse, Nora's friend, Mrs. Linde, fails to contact Krogstad and ask him to retrieve the letter. All of that is evidence that supports the prediction that Helmer will learn the contents of the letter.

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