The roman empire was so large that it covered europe, north africa, and parts of asia. the large empire was hard to rule. what did the emperor do to solve this problem? a. he sold half of the roman empire to china to break up the empire and increase his wealth. b. he separated the large empire into four smaller empires and assigned four emperors to govern each part. c. he divided the large empire into two smaller empires: an eastern empire and a western empire. d. he ended the roman empire all together and let each small city-state rule themselves.