The correct answer is C) mosaic.
This piece of Roman art is an example of a mosaic.
During the Roman Republic and the Roman Empire. one of the most notable forms of art in ancient Rome was the elaboration of portraits using small mosaics. This form of art was directed influenced by the beautiful Greek or Hellenistic mosaics. The mosaics that had been found are exhibited in some important museums of the world such as the Louvre, in France, shows the portrait of a political or military character of the time, or the representation of a battle.