“When the doctors came they said she had died of heart disease - of joy that kills." Which one of the following explains why the short story, The Story of an Hour ends with the phrase "...of joy that kills"? I. To convey a sense of irony. II. To make the readers judge Mrs. Mallard. III. To convey Mrs. Mallard’s sheer sense of shock. IV. To explain Brently Mallard’s shock at the incident.