Which is an example of trace evidence?

a. an eyewitness sees a man flee from a robbery at a convenience store.

b. an old bloodstain on a floor is revealed by uv light.

c. tiny glass fragments are found outside a broken door of a jewelry store where a burglary occurred.

d. a gun is found at the scene of an armed robbery.

The answer is C. The FBI defines Trace evidence as "... materials that could be transferred during the commission of a violent crime. These trace materials include human hair, animal hair, textile fibers and fabric, rope, feathers, soil, glass, and building materials."

Because making that substance is does not generate that much pollutants, but using that substance generates more pollution.