About 65 million years ago, an asteroid hit the area that is now the Yucatan Peninsula of Mexico. Which of these was a major effect of this impact event?   A It lead to the creation of most of the Earth's fossil fuels, by creating burned plant mater that was later buried by sediment.   B Prior to this event, complex life forms didn't exist on Earth, and the impact brought new life forms that colonized the planet's ecosystem.   C It caused a mass extinction that included the extinction of the dinosaurs.   D It gave rise to the large amount of oxygen in the Earth's atmosphere, which had been rare prior to 65 million years ago.

About 65 million years ago, an asteroid hit the area that is now the Yucatan Peninsula of Mexico. Which of these was a major effect of this impact event?