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. We now know that ancient trade cannot be considered a main factor in the rise of civilization, because no one aspect of it caused change in culture or commercial practices. B. We now know that the growth of civilization was an important factor in causing cultural change and in improving commercial practices. C. We now know much more about how ancient trade and commerce led to cultural changes and the evolution of commercial practices. D. We now know much more about the main factors and agents that led to ancient civilization, because we know what aspects of trade affected culture and commercial practices.