Question ID:PT78 S3 Q2 Passage:An unstable climate was probably a major cause of the fall of the Roman empire. Tree-ring analysis shows that Europe's climate underwent extreme fluctuations between 250 A.D. and 550 A.D., a period that encompasses Rome‚ s decline and fall. This highly variable climate surely hurt food production, which made the empire harder to rule and defend. Stem:Which one of the following, if true, most strengthens the argument? Correct Answer Choice:DChoice A:Political failures within the Roman empire during its last years led to conflicts that hampered agricultural production. Choice B:The areas of the Roman empire that had the greatest climatic instability between 250 A.D. and 550 A.D. did not experience unusual levels of unrest during that period. Choice C:Poor farming practices led to depleted soil in many parts of Europe during the last years of the Roman empire. Choice D:During periods when the Roman empire was thriving, Europe consistently experienced weather that was favorable for agriculture. Choice E:Total food production in Europe was likely greater in the years around 550 A.D. than in the years around 250 A.D.