In Edgar Allan Poe's The Cask of Amontillado the literary device of foreshadowing is used to create mystery when Montresor tells Fortunato

A- "You are a man to be missed"
B- A draught of this Medoc ill defend us from the damps"
C- "you were not to be found and i was fearful of losing a bargain"
D- "you are rich, respected, admired, beloved; you are happy as once I was.

C- "you were not to be found and I was fearful of losing a bargain"

The correct answer is C- "you were not to be found and I was fearful of losing a bargain." This quotation foreshadows the impending danger that Fortunato will face as Montresor expresses his fear of missing out on the opportunity to carry out his revenge.