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A student observes the rock shown.

What question can the student ask to help describe the rock's luster?
A.
Is the rock hard?

B.
Is the rock shiny?

C.
Is the rock smooth?

D.
Is the rock dark in color?

To describe the rock's luster, the student can ask the question: "Is the rock shiny?" (Option B). Luster refers to the way a mineral's surface reflects light, and asking whether the rock is shiny or not will help determine its luster. Shiny rocks typically have a metallic or glassy luster, while non-shiny rocks may have a dull or earthy luster.