Answer: B.The Kievan Rus' became more isolated from European civilization.
Explanation: After the Mongol conquest of the Kievan Rus', the Kievan Rus' were even more isolated from European civilization. The Mongols allowed the Kievan Rus' to continue many of their cultural practices, including allowing them to remain Christian. In exchange, the Mongols demanded taxes and loyalty to the Mongol ruler.