This relief sculpture is an example of a
a. high relief
c. freestanding relief
b. low relief
d. sunken relief

There should have been a picture of the relief sculpture. I'll just define the choices.

Here are the three types of relief sculpture:

1) High relief is a sculpture whose form extends at least halfway out of the back ground. 

2) Low relief is a sculpture whose form projects only slightly from its background.

3) Sunken relief is a sculpture whose carvings are sunk below the level of the surrounding surface. 

The linear perspective changed the quality of art because it gave art a sense of reality. it gave the illusion that the background and surroundings were actually close and/or far and a sense of depth. linear perspective change the quality of art following its birth the renaissance period as they want the art to be more realistic and they believe one way to achieve it is to use the method of linear perspective. it uses the principle of math to realistically portray space and depth in art.