Why did king charlemagne promote increased literacy through the establishment of schools? to assist the poor people in finding better jobs to the children of impoverished families to aid expansion and administration of the kingdom to increase the number of educated citizens.

To aid expansion and administration of the kingdom

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

one of these is the rhoticity common in most american accents, because in the 17th century, when english was brought to the americas, most english in england was also rhotic.