What is an intensive property of a substance?

A. density

B. volume

C. length

D. mass

An intensive property of a substance is A. density

Density is the ratio between the mass of a sample and its volume. So since it's a ratio, it will always be the same regardless of how much of the sample it measured. When a property, like density, is independent of the amount of sample measured, it is known as an "intensive" property.

The answer is A. density