Read the passage from A Doll’s House.

Nora: And when she heard you had been appointed manager of the Bank—the news was telegraphed, you know—she travelled here as quick as she could. Torvald, I am sure you will be able to do something for Christine, for my sake, won't you?

Helmer: Well, it is not altogether impossible. I presume you are a widow, Mrs. Linde?

Mrs. Linde: Yes.

Helmer: And have had some experience of book-keeping?

Mrs. Linde: Yes, a fair amount.

Helmer: Ah! well, it's very likely I may be able to find something for you—

Nora: [clapping her hands] What did I tell you? What did I tell you?

Helmer: You have just come at a fortunate moment, Mrs. Linde.

Mrs. Linde: How am I to thank you?

Helmer: There is no need. [Puts on his coat.] But today you must excuse me—

Rank: Wait a minute; I will come with you. [Brings his fur coat from the hall and warms it at the fire.]

Which element in this passage tells the reader who the characters are?

the dialogue
the speaker tags
the stage directions
the characters’ actions