Which of the following offers the best explanation of how the exposition develop the plot of the story?

In the Story of an Hour, the best explanation of how exposition helps develop the plot is option 2 ( it establishes that Mr Mallard has died and reveals that Mrs Mallard is physically and perhaps emotionally frail, which sets up the conflict) because it might be the revelation of what she feels and how relief  she is about her husband's death.

Only if that could happen to everyone