Answer :
"B. Byzantine cities were excellent marketplaces for merchants from Europe, Africa, and Asia" is the only option that is completely true, although they did benefit from the silk trade.
The correct answer is “Byzantine cities were excellent marketplaces for merchants from Europe, Africa, and Asia”
Byzantine cities flourished because of merchants and markets, Constantinople, for example, became a center for foreigners who went there to buy and sell. This developed the need for markets and merchants. The Byzantines sold silks, spices, incense, pottery, and other goods were sold in these cities. The location of Constantinople was perfect because it stood in a crossroads of Europe and Asia and the sea that linked the east to the west. Historians say that around 1 million people lived in Constantinople at its high point.