Which most accurately describes events during kublai khan’s rule of the mongol empire (yuan dynasty)?

kublai khan overthrew and assassinated genghis khan, creating a civil war within the mongol empire.
kublai khan rejected chinese confucianism and implemented mongol paganism as china’s ruler.
kublai khan welcomed marco polo from italy, which increased trade between the east and west.
kublai khan created the great wall of china, effectively closing china’s borders to the west.