Why did the empire decline after the death of marcus aurelius in
a. d. 180?

trade was disrupted, hurting the economy

many mercenaries were hired, hurting the economy

provincial battles

power struggles

Explanation:

Because of these factors, the economy was damaged and disrupted.

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.