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. Predators at the beginning of the Cambrian period had to become more sophisticated in order to survive in environments with newly adapted animals. B. New adaptations had an opportunity to survive at the beginning of the Cambrian period because early predators were not yet sophisticated enough to eliminate the animals with these adaptations. C. Early predatory animals lacked sophisticated adaptations because they did not develop them during a window of opportunity in the early Cambrian period. D. Early predators had an opportunity at the beginning of the Cambrian period to remove new adaptations before they established themselves in the environment.