Answer:
To aid expansion and administration of the kingdom
Step-by-step explanation:
King Charlemagne was the king of the territory compreending most of western and central Europe during the early Middle Ages.
His success as a warrior was related to his dedication to learning and education. In this context, to have success in the wars and expand the kingdom, he increased literacy through the establishment of schools.
So the correct answer is
To aid expansion and administration of the kingdom