There are several competing theories that explain why dinosaurs became extinct. One theory states that an asteroid impact occurred causing a dust cloud that blocked sunlight. Another theory states that volcanic gas and dust in the atmosphere blocked sunlight. Why are both these theories reasonable explanations for the extinction of the dinosaurs?
They both would have affected large animals only such as dinosaurs
They both would have affected large animals only such as dinosaurs

They both would have caused the instant extinction of dinosaurs worldwide.

They both would have caused the instant extinction of dinosaurs worldwide.,

They both would have resulted in less plant life and less available food.

They both would have resulted in less plant life and less available food.,

They both would have caused the temperature of Earth to increase.