The Presence of Iridium in Geologic Deposits Around the World

The presence of iridium in geologic deposits around the world supported the theory that:

A) the impact of a giant meteor that struck the Earth produced mass extinctions of dinosaur species across the planet.
B) alien material was a factor in the origins of species on this planet.
C) catastrophes occurred in the past and produced major changes in species, causing dinosaurs to adapt and eventually become mammals.
D) Cuvier's proposal of catastrophism as the theory explaining human origins is correct.