According to paragraph 3, which of the following is true of changes in climate before the Cretaceous period and the effect of these changes on dinosaurs? A. Climate changes associated with the movement of seaways before the Cretaceous period did not cause dinosaurs to become extinct. B. Changes in climate before the Cretaceous period caused severe fluctuations in sea level, resulting in the extinction of the dinosaurs. C. Frequent changes in climate before the Cretaceous period made dinosaurs better able to maintain a livable body temperature. D. Before the Cretaceous period there were few changes in climate, and dinosaurs flourished.