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. Renfrew said that local variables affected the complex social organization of the early Bronze Age. B. Renfrew said that the major changes in social organization could be understood only by examining the effects of the new developments that took place in the early Bronze Age. C. The early Bronze Age, Renfrew said, was a time in which there were major changes to many interrelated aspects of local social systems. D. To understand the social organization and complexity of the early Bronze Age, it was necessary, said Renfrew, first to determine what new variables had emerged.