Answer:
A. Foreshadow what is about to happen to him.
Explanation:
Edgar Allen Poe's short story "The Cask of Amontillado" revolves around the character of Montresor who takes revenge on his friend Fortunato for the many insults that he's had endured from the man. Montresor decided to lure Fortunato with wine tasting which was the favorite thing Fortunato loves.
As planned, Montresor took Fortunato to his family's vault so that they can taste the Amontillado without anyone knowing about it. Fortunato has no idea about what was to come soon, and he merrily went along, feeling excited to be having the wine. When Montresor offered him a glass of wine that he "drew from a long row of its fellows that lay upon the mold", Fortunato raised a toast "to the buried that repose around us". This is a case of foreshadowing where his action somehow hints to a situation that will happen in the future.
Foreshadowing hints at a similar situation, acting as a warning sign for something to happen shortly. And Fortunato's toast is a foreshadowing of his fate, where he will also lie repose in the vault.
