Final answer:
Foreshadowing in "The Cask of Amontillado" is demonstrated through the narrator's desire for revenge against Fortunato.
Step-by-step explanation:
Foreshadowing is a narrative technique where the author gives hints about plot developments to come before they happen. In "The Cask of Amontillado" by Edgar Allan Poe, an example of foreshadowing is the narrator's mention of his desire for revenge against Fortunato. This hint suggests that something bad will happen to Fortunato later in the story. Therefore, the correct answer is a) Dramatic irony.