Answer:
c. He told us in the first sentence.
Step-by-step explanation:
In Edger Allen Poe's short story "The Cask of Amontillado", the protagonist and narrator of the story is Montresor. He begins by saying "Fortunato had hurt me a thousand times and I had suffered quietly". This very first lines shows his contempt for Fortunato and how he had planned to exact revenge on him for all the insults he had endured. He told us about his hatred for Fortunato but the man himself doesn't know anything about it.