The Ottomans Took the Byzantine Cathedral Hagia Sofia and

The Ottomans took the Byzantine cathedral Hagia Sofia and

A) burned it to the ground as part of the looting after Mehmed II's conquest.
B) turned it into a special university for Janissaries.
C) restructured its configuration to become the great palace of the sultans.
D) converted it into the mosque of Aya Sofya.
E) used it as an astronomical observatory.