Correct Option: D

During the rule of Firoz Shah, the minar's two top floors were damaged due to lightning but were repaired by Firoz Shah. In the year 1505, an earthquake struck and it was repaired by Sikandar Lodi. Later on in the year 1794, the minar faced another earthquake and it was Major Smith, an engineer who repaired the affected parts of the minar. He replaced Firoz Shah's pavilion with his own pavilion at the top. The floors built by Firoz Shah can be distinguished easily as the pavilions was built of white marbles and are quite smooth as compared to other ones.