The aspect of the setting that helps to develop the theme about imprisonment and freedom in this excerpt is: The open window in her room that brought in fresh air brought a sense of freedom to her.
This actually reveals that she has been in a kind of prison but she is free and feels a major weight lifted from her soul.
Let's understand what theme actually means.
Theme is known to be the major idea in a story that the author or writer is trying to communicate to the readers. Theme gives readers the lesson to learn from the story.
We can see that from the story, Mrs. Mallard seem to be in a prison. Her whisper of "free" thrice depicts her freedom.
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