What term refers to physical harm caused to someone or something owing to a mistake or wrong action?

The question asks for the term that refers to "physical harm caused to someone or something owing to a mistake or wrong action."

Let's analyze the options:

• a) damage: This term typically refers to physical harm to property or objects.
• b) harm: This is a very general term that can include physical, psychological, or financial detriment. The question specifically asks about "physical harm."
• c) injury: This term primarily refers to physical harm or damage to a person or other living being. However, in a broader or legal context, "injury" can also refer to harm or damage to property (e.g., "injury to property"). Given that the question includes "someone or something," and "injury" can encompass both in its broader definition, it is a strong candidate.
• d) incident: An incident is an event that results in, or has the potential to result in, harm or damage. It is the event itself, not the physical harm.

Considering the options, "injury" is the most appropriate term. While it most commonly refers to harm to a person, its definition can extend to include damage to property, thus covering both "someone" and "something" as stated in the question.

The correct option is c.
$\boxed{\text{c. injury}}$