The most probable answer to the options presented in this problem would be the last one which is D. "Young Goodman Brown"
Young Goodman Brown acted as an allegory on the fall of man which is connected to American religion. The other three: A Pair of Silk Stockings, The Private History of a Campaign That Failed, and Paul's Case, would be short stories that aren't as allegorical as they seem. These three may have presented the possibilities of being an allegory especially that they have images that are allegorical, but the plot and the story aren't as such.
