Answer: D) They considered them shallow and weak.
Explanation: In the given excerpt about the play "A Doll's House" by Henrik Ibsen, set in the Victorian era, we can see some of the pet names that Torvald Helmer (the main character) has for his wife Nora, this pet names: "frightened singing-bird," "little squirrel," "spendthrift," etc, shows how the Victorian men thought of their wives as shallow and weak (because of the comparison to little animals), so the correct answer is option D.