Which of the Following Is Not a Piece of Evidence

Which of the following is not a piece of evidence supporting the idea that an impact caused the mass extinction that occurred 65 million years ago?

A) Grains of quartz formed under high pressure are found in a layer of clay that dates to 65 million years ago.
B) Unusually large abundances of iridium and other rare metals are found in a layer of clay that dates to 65 million years ago.
C) A large impact crater along the coast of Mexico dates to 65 million years ago.
D) Fossilized dinosaur bones contain fragments of rock from the impact.