Answer:
A). Characterization.
Step-by-step explanation:
Characterization is illustrated as the literary device that is employed to reveal the details or descriptions of a character. The authors employ direct or indirect characterization to portray a character either directly by employing sufficient adjectives or through the description of their actions or behavior.
As per the question, the given passage from "The Cask of Amontillado" would be best identified as 'characterization' which is reflected by the description like 'nature of my soul', 'will not suppose', 'I gave utterance to threat'. These descriptions offer an insight into the character's traits and thoughts. Thus, option A 'characterization' is the answer.