Yes, I am 100% sure. Shading is a technique that can be used to create the illusion of depth and dimension on a two-dimensional surface. By varying the intensity or darkness of the shading, artists can create the perception of form, texture, and volume.
The technique that can be used to show illusion on a two-dimensional surface is shading. Shading involves the use of different tones and values of color or gray to create the illusion of depth, form, and texture. By manipulating the intensity and direction of the shading, an artist can simulate three-dimensional objects on a flat surface, giving the viewer the perception of depth and volume. So, in this case, the correct answer is "shading."
