Correct answer: A. Coloured glazed tile
Explanation: The direct answer is A: coloured glazed tile. A glazed tile is a tile covered with a coating that becomes smooth, shiny and often brightly coloured after firing. Mahmud Gawan Madrasa at Bidar was built in the Bahmani period of the Deccan and is especially remembered for its decorative blue, green and other coloured glazed tiles. Therefore the clue “decoration” points to a surface-art technique, not to the basic building material. Option A works because coloured glazed tiles were an important visual feature of the madrasa. Option B, unbaked brick tile, is not the famous decorative feature and would be less durable and less shiny. Option C, iron tile, is not the recognised tile art of this monument. Option D, wooden tile, is also not the characteristic decoration and would not match the known ceramic tile work. Memory cue: Mahmud Gawan Madrasa—Bahmani Deccan—bright glazed tiles.