Which of the following is an example of arson?

Setting fire to a building intentionally is a clear example of arson because arson is defined as the willful and malicious act of setting fire to or exploding a property, particularly buildings. This act not only involves the deliberate use of fire but also demonstrates an intent to cause damage, which is a core element of the crime.

In contrast, the other choices involve different criminal acts: stealing a car pertains to theft, breaking into a home relates to burglary, and fraudulently using someone else's identity deals with identity theft. Each of these offenses has its own legal definitions and requirements, which are distinct from the specific crime of arson. The intentional act of igniting a fire to cause destruction uniquely defines arson and is why it stands out as the correct answer in this context.