What happened to Constantinople in 1453?

Responses
A It was conquered by the Roman Empire.It was conquered by the Roman Empire.
B It was destroyed by a massive earthquake.It was destroyed by a massive earthquake.
C It was conquered and renamed Istanbul by the Ottomans.It was conquered and renamed Istanbul by the Ottomans.
D It was destroyed by the invading forces of Genghis Khan.

C It was conquered and renamed Istanbul by the Ottomans.