Final answer:
Density of 2.6 g/ml is an intensive physical property.
Step-by-step explanation:
An intensive physical property is a property that is inherent to a substance and does not depend on the sample size. In the given options, the only intensive physical property is the density of 2.6 g/ml (option C). Density is a ratio of mass to volume and remains the same regardless of the amount of substance present.