Which scenario would most likely cause a mass extinction?

a. global temperatures drop several degrees after several massive volcanic eruptions
b. a disease kills off a single species of predator within an ecosystem
c. a massive earthquake strikes north america
d. a wildfire burns a national park

(i think it would be b)

Answer;

A. global temperatures drop several degrees after several massive volcanic eruptions

Explanation;A mass extinction refers to a widespread and a rapid decrease in the Earth's biodiversity. Mass extinctions may occur due to a number of reasons which includes, asteroid impacts, climate change, massive volcanic eruptions or a combination of all these causes. An example of mass extinction was during the Mesozoic Era, that led to the extinction of dinosaurs, about 65 million years ago.