Answer:
Option A, Constantinople became an important center of trade and knowledge, is the right answer.
Step-by-step explanation:
The Byzantine Empire was named after Byzas a man who founded Byzantium an ancient Greek colony. Geographically, it is located on a strait or at a point which served as a transit and trade center between Europe and Asia. Constantine I, the Roman Emperor in 330 A.D. chose Byzantium as the location of a New Rome with Constantinople as its capital city. The most significant factor that made the expansion of the Byzantine Empire was trade and commerce. It took Constantinople no time to become a trading hub and an important center for learning. Therefore, option A will be right.