An extensive (physical) property is one that is?

An extensive property is defined as a physical property that is dependent on the amount of matter present in a system. Examples of extensive properties include mass, volume, and total energy. These properties change accordingly if the size or amount of the material changes. For instance, if you have a container with water and you add more water, both the mass and volume of the water will increase, demonstrating their dependence on the quantity of material.

While other options touch on related concepts, the defining characteristic of an extensive property is its direct relation to the quantity of substance involved. The volume and mass mentioned in other options are indeed extensive properties as well, but are categorized under the broader definition that specific extensive properties are dependent directly on the total amount of matter. Thus, the correct answer focuses on the foundational principle of what constitutes an extensive property.