I believe it was Justinian that managed to unite Rome, and expanding the Byzantine Empire.
Answer:
I believe C to be correct.
Explanation:
Answer : The social class mainly belonged to peasant class or the working class and they contributed crops and other things.
Explanation : In early civilizations, the peasant class or working class were the largest social class by majority number of people. These people majorly worked in agriculture and grew the food and crops needed to sustain and feed the society. So, these were the only contributions they gave to early civilizations.
I am pretty sure your answer is B