Answer:
B. situational irony
Step-by-step explanation:
In "The Story of an Hour", we find Mrs. mallard getting the news of her husband's death. And through that new found freedom from her authoritative husband, she felt elated and was clearly overjoyed that she had a heart attack which in turn killed her. Her husband, who had been alive all those times came home to see his wife's death. This is a case of situational irony in that it is just the opposite of what was really expected. "Situational irony" is the occurrence of something that is expected but then the exact opposite happens instead.