Question ID:PT40 S3 Q24 Passage:New evidence suggests that the collapse of Egypt's old kingdom some 4,000 years ago was caused by environmental catastrophe rather than internal social upheaval. Ocean sediments reveal a period of global cooling at the time, a condition generally associated with extended droughts. There were, no doubt, serious social problems in Egypt at the time, but they resulted from a severe dry spell.  Stem:Which one of the following, if true, would most strengthen the argument? Correct Answer Choice:CChoice A:Historically, most civilizations have succumbed to internal strife rather than external factors. Choice B:The social problems in Egypt's old kingdom at the time of its collapse were serious enough to have caused the collapse. Choice C:At the time of the collapse of the old kingdom, several isolated but well-established civilizations near Egypt underwent sudden declines. Choice D:Egyptian records recovered from the time of the collapse explicitly refer to the deteriorating conditions of the society. Choice E:Shortly after the collapse of the old kingdom, Egypt was thrust into a civil war that lasted most of the next two centuries.