To be able to answer a question that involves a graph, I would need to see the graph :)
With the expression "greek miracle" we designate the appearance scientific knowledge, their achievements include great greek personages who had achieved really big disciplines like literature, history, geometry, mathematics, philosophy, etc, in the other hand the culture has also took biblical sources, which means accumulated knowledge in the sacred scriptures. so that's how Sumerian's achievements spread to other lands.
Answer:
C. preservation of Roman law.
Explanation:
One of the Byzantine Empire's greatest contributions to civilization was Emperor Justinian's preservation of Roman law.