Color is one of the worse ways to identify a material. I can confirm that it is the wrong option for a fact. I would believe the correct answer is "They will have the same color streak." If you go back through the lesson, you will learn why the color streak and the type of material will relate.
The best way to identify a mineral is the color of the mineral. The color of the minerals with different impurities is different. The pink color of the rose quartz and the gray color of the smoky quartz indicates that they contain different impurities. The impurities are the main factor behind the color of any mineral.
Hence, the correct answer is 'Color is the best way to identify a mineral'.
