Final answer:
An intensive property is a physical property that does not change with the amount of the substance; examples include temperature and density. Extensive properties, such as mass and volume, do depend on the quantity.
Step-by-step explanation:
An intensive property of a substance is a physical property that is independent of sample size. Examples of intensive properties include temperature and density, which remain the same regardless of the amount of the substance present. In contrast, extensive properties depend on the amount of matter present, such as mass and volume. A substance like gold has intensive properties like density which do not change whether you have a gram or a kilogram of it. On the other hand, its mass is an extensive property which will vary with the quantity of the substance.
Therefore, the best definition for an intensive property of a substance is 'd) A physical property that is independent of sample size'.