I believe it is C.
ROMANS- Education in ancient Rome progressed from an informal, familial system of education in the early Republic to a tuition-based system during the late Republic and the Empire. The Roman education system was based on the Greek system – and many of the private tutors in the Roman system were Greek slaves or freedmen.
GREEKS-The government systems of ancient Greece were varied as the Greeks searched for the answers to such fundamental questions as who should rule and how? Should sovereignty (kyrion) lie in the rule of law (nomoi), the constitution (politea), officials, or the citizens? Not settling on a definitive answer to these questions, government in the ancient Greek world, therefore, took extraordinarily diverse forms and, across different city-states and over many centuries, political power could rest in the hands of a single individual, an elite or in every male citizen: democracy - widely regarded as the Greeks' greatest contribution to civilization.
Answer:
relied on a system of slave labor
depended on cotton
was based on agriculture
The introduction of paper, information was democratized and it became possible to make a living from simply writing and selling books. The use of paper spread from China into Muslim regions in the 8th century, and then to Spain (and then the rest of Europe) in the 10th century.
