At the beginning of Act I, Nora seems pretty easy-going and nonchalant - even a little bit superficial. She seems to love her husband, even though he shows a patronizing attitude toward her and scolds her for spending too much money and resembling her father.
However, she already has some small acts of rebellion - such as eating macaroons in spite of the promise she gave Torvald. Her cheerfulness also seems a little bit strained. We can see that she is a dependent woman who is expected to play by certain rules. We can also anticipate that their marriage is not perfect, even though they act happy.
I believe the answer is the 3rd one