The correct answer to this question is D, Shape. The two dimensions of shapes are width and length. There are seven elements of art, and shapes are one of them. The other six are lines, form, color, value, space, and texture. These additional six elements work together by giving the shape its boundaries.
Specifically, when the amount is added, the shape can become an illusion, have highlights and shadows. Lines are what form shapes. For example, four tracks create a square, while three make a triangle. When space is used in conjunction with a way, it can create negative and positive spaces.