What kind of literally form is of "joy that kills" in the story of an hour

Joy that kills is a paradox because it is logical that joy a positive feeling cannot kill someone yet in this short story, the joy being taken away triggered Mrs. Mallard's heart attack.

"the sandy walls seemed to collapse in on themselves"

and

"the bloodshot waters seemed to have no bottom"

your answer is c) experiments with water vapor showed that elements combine in specific proportions.