What offense has Oscar committed by intentionally causing an explosion to collect insurance money?

The offense that Oscar has committed is arson. Arson involves the intentional act of causing a fire or explosion with the aim of damaging property or in this case, for financial gain, such as collecting insurance money. By intentionally causing an explosion, Oscar's actions fulfill the criteria for arson, as the act is deliberate and results in the destruction of property, typically with malicious intent.

In this scenario, arson is particularly relevant because it is not only about the damage caused but also includes the motivation behind the act—seeking to benefit financially from the destruction. The fact that the explosion was intentionally caused to collect insurance highlights the criminal nature of the act, making it distinctly an arson-related offense.