Which of the following best describes the historical situation in Eurasia at the time the passage was written? Frequent warfare limited the opportunities for cultural, scientific, and artistic innovation. Frequent warfare limited the opportunities for cultural, scientific, and artistic innovation. A Political upheaval and reorganization increased cultural and scientific exchanges across regions. Political upheaval and reorganization increased cultural and scientific exchanges across regions. B Revived long-distance trade spread pathogens and infections to regions that had not been previously affected by them. Revived long-distance trade spread pathogens and infections to regions that had not been previously affected by them. C The invention and spread of new weapons and military tactics radically transformed the global balance of power.