Solution: The answer is (d) nature of the material

The resistivity of a material is an inherent property of the material. As an intensive property, it does not scale with the system’s size, even if the system is scaled. Because it is independent of a material’s length, thickness, or dimensions, its nature is the only thing that matters. The resistivity of a material is a measure of how readily it resists or conducts an electric current that passes through it. A material with a high resistivity will make it difficult for the current to flow, whereas a material with a low resistivity will make it simple.