TOEFL Reading: ETS-TOEFL阅读机经 - 95B55OAT83L9R5W0L$

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. It is plausible that the development of high-frequency echolocation, large centers in the cerebral hemispheres, and/or a high degree of sociality may have contributed to the development of large brains. B. For an animal to recognize and have long- and short-term relationships with a number of other individuals, the animals must develop large centers in the cerebral hemispheres. C. Processing high-frequency echolocation information may have required a large, complex brain that already had the capacity to develop and recognize long- and short-term social relationships with multiple other individuals. D. The demands of processing high frequency echolocation information and/or a high degree of sociality may have favored the evolutionary development of a large, complex brain.