How did the lack of centralized government and legal codes force early medieval kings, like Charlemagne, to rely on violence to maintain order?

It meant the people had to carry out violent revolts.

It meant the king was controlled by his knights, who wanted to fight,

It meant there were no legal codes, since no one made laws.

It meant there was no way to bring vassals under the king's control.

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

i believe your answer is d)

panamal canal treaty and iran hostage crisis hope this

the commander in chief