Answer: What kind of poem are they talking about?
Explanation: If you are just guessing i would say d.
The answer is option B: The vacant stare and the look of terror that had followed.
In the passage from "The Story of an Hour," by Kate Chopin, it is not necessary to separate the subject with two elements with a comma - the vacant stare and the look of terror.
Options A, C and D are incorrect because they contain a misplaced comma.
It shows that there are more sources for the reader to read, and it also is strong supporting evidence for the main idea.