Final answer:
The true statement is that forest fires are common in grasslands and serve to maintain the ecosystem, unlike arson, which is a criminal act.
Step-by-step explanation:
The correct answer is option A. In grasslands, forest fires are indeed common occurrences, but they serve a different ecological purpose than pyromania, which is a deliberate setting of fires due to a psychological disorder. Natural grassland fires can play an important role in the ecosystem by resetting the successional stages of plant growth, controlling invasive species, and returning nutrients to the soil. It should be noted, however, that arson is a criminal act of deliberately setting fire to property, including wildlands or forests, and is not directly related to the natural fire cycles of grassland ecosystems.
Pyromania is a mental disorder characterized by an obsession with fire-setting and the intentional act of setting fires for pleasure, thrill, or relief. Arson, on the other hand, refers to the crime of deliberately setting fire to property with the intent to cause damage or harm. While not all cases of pyromania lead to arson, one form of pyromania can indeed be arson.