In paragraph 1, why does the author include a discussion of when flowering plants evolved?

• To help explain why some scientists believe that the development of flowering plants led to dinosaur extinction
• To cast doubt on the theory that the development of flowering plants caused dinosaurs to become extinct.
• To suggest that dinosaurs were able to survive for as long as they did because of the availability of flowering plants
• To emphasize that duckbill dinosaurs and horned dinosaurs were the first dinosaurs to become extinct

This is a multiple choice.