Final answer:
The irony in Armand finding out he is black is an example of situational irony because it contradicts his earlier beliefs and attitudes, providing an unexpected twist in the story.
Step-by-step explanation:
The type of irony that represents the fact that Armand finds out that he is black at the end of the story is C) Situational Irony. Situational irony occurs when there is a discrepancy between what is expected to happen and what actually happens. In the context of the story, the irony lies in the fact that Armand, who is a character that has shown disdain for those of black descent, discovers that he himself has black heritage. This revelation is ironic because it completely contradicts Armand's beliefs and attitudes towards race and identity throughout the story, thus providing a twist that opposes the expectations set by his character.