Which of the following is TRUE？A．Environmental changes must have caused the end－Permian ma

Which of the following is TRUE？

A．Environmental changes must have caused the end-Permian mass extinction.

B．Massive volcanic eruptions might have caused the end-Permian mass extinction.

C．The disappearance o{ dinosaurs was a consequence of the end-Permian mass extinction.

D．Marine animals appeared as a result of the end-Permian mass extinction,

请帮忙给出正确答案和分析，谢谢！