Final answer:
The property of brass that is an extensive property is Length, as it changes with the amount of matter present.
Step-by-step explanation:
When analyzing the properties of brass and identifying whether they are extensive or intensive properties, it's important to note that extensive properties depend on the amount of matter present. Options A) Density, B) Melting Point, and C) Color are all intensive properties as they do not change with the amount of matter present. Density, for instance, remains constant regardless of the sample size. However, D) Length is an extensive property because it changes when the amount of matter changes. A longer piece of brass will have a different length than a shorter piece, even if the material is the same.