Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information. A. The dominance of dinosaurs came to an end 65 million years ago, at which time mammals began to flourish and diversify. B. Because no group of species can remain dominant forever, mammals became the dominant group when dinosaurs became extinct. C. After being the dominant group for more than 200 million years, the age of dinosaurs came to a dramatic end 65 million years ago. D. The diverse group of mammals that we know today, including bats and whales, evolved from small terrestrial forms that had been dominated by dinosaurs.