Final answer:
While irony involves outcomes that are contrary to what is expected, option B (Sally marrying Gabe) does not appear to be ironic without further context that suggests an expectation contrary to this outcome.
Step-by-step explanation:
Irony often involves an outcome that is contrary to what is expected. To identify the scenario that would NOT be described as ironic, it is important to understand the concept of irony in literature. When something happens that is opposite to what is expected, or when there is a reversal of what appears to be the case, irony is at play.
A. The entrance to the Underworld being in Los Angeles is an unexpected and opposite location for such a mythological place, therefore it could be considered ironic.
B. Sally, Percy's mother, marrying Gabe is not in itself ironic unless there was an expectation set in the narrative that she would not or should not marry him.
C. Luke giving Percy flying shoes can be considered ironic if it is understood that Percy, as a son of Poseidon, should not fly, or if the shoes are meant to harm rather than help him.
D. The Furies attacking Percy is likely a predicted outcome within the narrative framework if Percy is understood to have defied the gods in some way, making this event expected and therefore not ironic.
From the given options, B (Sally marrying Gabe) would NOT be described as ironic without additional context suggesting an expectation contrary to this outcome.