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. In many areas besides Abu Hureyra, complex factors led to new economies including the herding of domestic stock. B. In 'Ain Ghazal and Syria, domestic stock was more important than it was at Abu Hureyra. C. Once early methods of herding animals improved, new economies were adopted. D. Many complex theories attempt to explain the early domestication of animals.