The correct option is C Both A and R are correct.
Explanation:
Charlemagne of the Carolingian dynasty was the emperor of the Frankish Empire.
He, rescued Pope Leo III, the spiritual leader of the Catholic Church from the attack of the Lombard tribe.
Pope Leo III, therefore crowned Charlemagne, as the Holy Roman Emperor as a sign of his gratitude.
The empire of Charlemagne came to be known as the Holy Roman Empire.
Solution: A - Both A and R are correct.