Which of the following describes a difference between the Mongol Empire immediately following Genghis Khan's death and the empire immediately following Kublai Khan's death?

AAfter Genghis Khan died, the Chinese were able to capture most of the Mongol territory. After Kublai Khan died, the Mongols recaptured it.

BAfter Genghis Khan died, the Mongol Empire shrank. After Kublai Khan died, it grew rapidly.

CAfter Genghis Khan died, the Mongol Empire remained a unified state. After Kublai Khan died, the empire was divided.

DAfter Genghis Khan died, the pax Mongolica began. After Kublai Khan died, the pax Mongolica ended.