Final answer:
The Magyars, Vikings, and Muslim Saracens posed threats to Western Europe post-Carolingian Empire, while the Chinese did not.
Explanation:
Magyar invaders, also known as the Hungarians, swept across Europe in the tenth century, settling in present-day Hungary. They launched raids for plunder into Germany until being defeated in 955. While the Vikings from the north and Muslim Saracens from the south posed significant threats to Western Europe after the fall of the Carolingian Empire, the Chinese were not among the groups threatening land in western and central Europe during that period.
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