After the Death of Louis the Pious,the Carolingian Empire

After the death of Louis the Pious,the Carolingian empire

A) reversed a short period of decline and reached its greatest territorial extent.
B) was swallowed up by a resurgence of Byzantine power.
C) was split into three parts by his sons.
D) became a puppet state controlled by the expanding Islamic empires.
E) fell under British control.