What are the primary contributing factors to the Permian extinction event, and how did they interact to affect marine and terrestrial life?

• A. Gradual climate change leading to ice ages, which affected only terrestrial life.
• B. Volcanic activity leading to a temporary cooling of the climate, which affected only marine life.
• C. Volcanic activity causing greenhouse gas emissions and warming, leading to ocean acidification and anoxia, affecting both marine and terrestrial life.
• D. Meteorite impact causing wildfires on a global scale, leading to the extinction of terrestrial life.