After Charlemagne's death, his kingdom declined due to all of the following except a. Louis the Pious, his son, was weak and short sighted. c. Muslims, Slavs, and Magyars invaded the kingdom. b. The Spanish March collapsed, leading to a Viking invasion. d. His sons split the kingdom and continued to fight each other.
After Charlemagne's death, his kingdom declined due to: Louis the Pious being weak and short sighted, Muslims, Slavs and Magyars invading the kingdom, and his sons split the kingdom and continued to fight each other. Therefore the answer is B.
