The correct answer is A) Mosaics.
The architectural form of Islamic art that was replaced in Romanesque art because of the cost of production was mosaics.
Mosaics were a characteristic of Islam art. These small pieces of decoration are marvelous and decorated most of the Muslim buildings and public places. These mosaics had geometric figures that formed incredible shapes as part of the total composition.
In the times of the Byzantine Eastern Roman Empire, Islam art was part of the decoration of religious buildings, as well as in the Arabic Peninsula or Syria. However, mosaic art was very costly and had to be modified in Romanesque art because of the cost of production.