Answer: b. She is seeing the positive side of her husband's death.
Explanation: In this passage from "The Story of an Hour" by Kate Chopin, the related issue that is being suggested by Mrs. Mallard's demeanor is that she is seeing the positive side of her husband's death. Mrs. Mallard has just been told that her husband is dead. She finds that she can see things from the positive side. She is free now.