The correct option is D Aden
While the Western European cities were expanding, the Eastern world was booming with large cities and commercial centres. Baghdad and Constantinople, capital cities of the Abbasid Empire and the Eastern Roman Empire respectively, became famous commercial centres. The commodities that came through the Silk Route and the Spice Route were brought to Europe through Basara, Aden, Mecca, Muscat, Damascus, and Surat.