(Now HELEN begins groping, sensing something, trembling herself; and KATE, falling one step in onto her knees, clasps her, kissing her. HELEN clutches her, tight as she can. KATE is inarticulate, choked, repeating HELEN’S name again and again. She wheels with her in her arms, to stumble away out the doorway. . . .)

How do these stage directions add meaning to the play?

The stage directions explain the characters’ facial expressions.
The stage directions illustrate the appearance of the room.
The stage directions reveal the historical time period.
The stage directions describe the characters’ emotions.