which event forshadowa the resolution of " The Cask of Amontillado" and creates mystery in the story?

The event that foreshadows the resolution of "The Cask of Amontillado" and creates mystery in the story is when Montresor tells Fortunato that he has the Amontillado in his vaults and invites him to come and taste it.

In "The Cask of Amontillado" by Edgar Allan Poe, the event that foreshadows the resolution and creates mystery in the story is the conversation between Montresor and Fortunato about the Amontillado. Montresor mentions to Fortunato that he has obtained a cask of Amontillado, a rare and valuable type of sherry. He uses this knowledge to lure Fortunato into the catacombs, suggesting that they should go and taste the Amontillado together.

This creates mystery because it raises questions about why Montresor would invite Fortunato to taste the Amontillado in the catacombs, rather than at a more appropriate setting. It hints that there may be ulterior motives or hidden intentions behind Montresor's actions, which will eventually lead to the resolution of the story.