Which of the following best describes first-degree arson?

First-degree arson refers specifically to the intentional act of burning or damaging property, particularly when it involves a multi-unit dwelling. This classification highlights not only the intent behind the act but also the potential harm to individuals living in close proximity. The significance of targeting multi-unit dwellings underscores the heightened risk to life and the greater potential for widespread damage, which can endanger multiple families or residents.

The other options involve scenarios that either lack intent or concern accidental actions, which do not meet the legal definition of first-degree arson. Destroying property through negligence or creating a fire by accident are generally associated with less severe charges, such as unintentional damage or negligence, rather than the deliberate criminal intent required for first-degree arson. Attempting to save property from being burned signifies an intention to prevent damage, contrasting with the purposeful actions that define arson. Thus, the correct answer encapsulates the essential elements of intent and target in the context of first-degree arson.