Read the following excerpt from "The Cask of Amontillado."

"The thousand injuries of Fortunato I had borne as I best could, but when he ventured upon insult I vowed revenge. You, who so well know the nature of my soul, will not suppose, however, that gave utterance to a threat. At length I would be avenged; this was a point definitely, settled…"
What is Montressor's tone?

A)mischievous
B)vengeful
C)irritated
D)upset