What were the greatest challenges that people in europe faced after the death of charlemagne in 814

the

explanation:

answer is b.

  it is always the best policy to have good communication and good relations between individuals and, specially, between leaders of the countries. for this purpose, among others, there is a common place, the united nations, where the representants can present his and learn about the other country's policies.

the correct answer is the last one accuustomed to millary involvement overseas hope this !