Answer:
C: Istanbul
Step-by-step explanation:
In 1453, the Ottoman Empire, under the leadership of Sultan Mehmed II, conquered the Byzantine capital of Constantinople after a long siege. Mehmed II then renamed the city Istanbul and made it the new capital of the Ottoman Empire. Istanbul remained the capital of the Ottoman Empire until its dissolution in the early 20th century, and today it is the largest city in Turkey and one of the most important cultural and economic centers in the region.