Answer: B) a holiday that commemorates U.S. prison guards and jailers is called "freedom day"
Explanation: an irony is a state of affairs or an event that seems contrary to what one expects and it often has an amusing result. A situational irony is when what happens is the contrary to what the characters or the audience are expecting to happen. From the given options, the one that represents an example of an irony (specifically a situational irony) is the corresponding to option B, because calling "freedom day" a holiay that commemorates prison guards and jailers, is contradictory.