I think the answer is D.Sparta had two kings
The answer is A. A network of abolitionist and safe house arranged to help slaves exscape to free territories
The correct answer is The study of ancient Greek language and education helped Justinian create a "New Rome". It so because for the time when Justinian was Emperor of the Easter Roman Empire, the empire had already a marked religion and culture and cetain power on west. Nevertheless, this Empire couldn't be considered as influencer and thats why, taking into account the Greek education he wanted to create a "New Rome"; this because he didn't want his Roman Empire to fail as it happened to Western, and also because originally for the "first Rome creation" the Greek models had been taken into account and were successful.
Four American presidents were driven to send weapons and soldier to fight in Vietnam due to the B. fear of communism spreading to many Asian countries. Around this time, US policymakers relied upon a concept of the "Domino Theory," which argued that if one nation were to fall to communism, countries nearby would then become communist.