What Is a Possible Cause of the Extinction Event Called

Multiple Choice

What is a possible cause of the extinction event called the Great Dying?

A) a meteorite impact that killed the dinosaurs
B) a great outpouring of lava at the end of the Paleozoic
C) a sudden increase in the oxygen content of the atmosphere during the Precambrian
D) a new kind of super predator that devoured nearly all of the life in the oceans