How is arson defined in legal terms?

Arson is legally defined as the willful and malicious act of causing damage to property by starting a fire or initiating an explosion. This definition encompasses not only the act of igniting a fire but also the intent behind it, which is essential in distinguishing arson from other fire-related offenses. It emphasizes the element of intent to destroy or damage property, making it a serious criminal offense. The focus on both fire and explosion broadens the scope of the definition, allowing it to cover various means by which property may be endangered or destroyed.

While other options may touch on related concepts—such as using explosives or causing damage through negligence—they do not encapsulate the full legal definition of arson. For instance, the intentional use of explosives (the first option) could relate to scenarios not involving a fire, and damaging property through negligence lacks the deliberate intention that characterizes arson. The act of setting fire to any material, while somewhat relevant, does not specify the intent or the resultant damage, which are crucial in the legal context of arson. Thus, option C accurately captures the essence of what constitutes arson, making it the correct answer.