Which Is NOT a Reason That We Suspect That the Extinction

Multiple Choice

Which is NOT a reason that we suspect that the extinction of the dinosaurs was caused by a large impact by a large object?

A) Many dinosaur fossils are found below the K-T boundary, but none above it.
B) The material in the K-T boundary is rich in iridium.
C) Soot is found in the material in the K-T boundary, which probably came from fires caused by the impact.
D) An impact crater has been found near Mexico's Yucatan Peninsula.
E) The remaining meteorite has been identified on the bottom of the Gulf of Mexico.