Answer:
The correct answer is C:
The blank walls of the basilicas were used to create wall mosaics, using small colored glass cubes.
Step-by-step explanation:
The growth of Christian-related buildings and structures also influenced other forms of art. Suddenly, there were large walls and various spots within the basilicas and other buildings that could be filled with Christian- related art. One of the early solutions applied to these blank walls was to create wall mosaics, using small colored glass cubes. The glass produced a more brilliant color, particularly when combined with the light coming through the basilica, than the materials that had previously been used for floor mosaics.