C is the answer to this question. An extensive property is one of the properties of matter that will change depending on the amount of matter that it will be exposed to. Mass is one example of an extensive property. For example, you are going to place a kilo of bananas in one place.
This kilo of bananas will have a certain amount of mass, but if you would add another kilo, then it will be heavier. This means that the mass of all the bananas that you have placed in one area has already changed.
This is different from the color, which may change but not readily. The color of bananas may be green or yellow, but it will not change immediately just because you have added one banana.