Final answer:
The underlined stage direction in Trifles creates a calm mood by highlighting the significance of the rocker.
Step-by-step explanation:
The underlined stage direction in the excerpt from Trifles affects the mood of the scene by creating a calm mood. The emphasis on the rocker serves as a reminder of something that is typically used to pacify or soothe individuals. In this context, the rocker represents a moment of normalcy and peace amidst the tragic events surrounding Mrs. Wright's husband. It adds a sense of tranquility to the scene, contrasting with the tension and hostility that may be present in other aspects of the story.
Learn more about The effect of stage directions on the mood of a scene