1. A.) Irony/Sarcasm
This is an example of dramatic irony. The audience knows that Fortunato is headed towards his doom, but he does not. In this case, the character, Fortunato, expects something different than what is actually happening.
2. C.) Characterization
Characterization is the way the author reveals the character's traits and personality. In this example, Montressor is being characterized as vengeful. His motivation for killing Fortunato is based solely on the "injuries" Fortunato has dealt him. The reader also is suspect of the narrator when he says this. It seems as though Montressor may be over exaggerating and this makes him an unreliable, and possibly unstable, narrator.