C. would be the best explanation
Answer: Combatants: Soviet Union; United States
Explanation:Historians have identified several causes that led to the outbreak of the Cold War, including: tensions between the two nations at the end of World War II, the ideological conflict between both the United States and the Soviet Union, the emergence of nuclear weapons, and the fear of communism in the United States.
My Answer: The Byzantine Empire.
Why?: " As a result of these advantages, the Eastern Roman Empire–variously known as the Byzantine Empire or Byzantium–was able to survive for centuries after the fall of Rome."
Hope I helped! :D