Question

streak may be a more reliable property than color to help you identify a mineral. streak is the color of a mineral when its powdered. even a mineral that comes in different colors will have the same color streak. that means that a minerals streak might be different from its main color. calcite, for example, may be white, yellow, brown, orange, pink or many other colors. it can also be multicolored. but calcite always has a white streak. streak can help distinguish minerals that have the same or similar main color. you can test a minerals streak by rubbing it against a streak plate or a white tile.
when might a streak test be useful?
choose one option
a when a mineral comes in different colors
b when a mineral is multicolored
c when two minerals have similar main colors
d all of the above

Explanation:

The text states that streak can help identify a mineral. It mentions that even a mineral with different colors will have the same streak (supports A), a mineral can be multicolored but streak helps (supports B), and streak can distinguish minerals with similar main colors (supports C). Since A, B, and C are all valid reasons based on the text, D (all of the above) is correct.

Answer:

D. all of the above