D. An element that is concerned with height and width, and that encloses space.
Color is the element of art that is concerned with reflected light.
Movement is the principle of art that helps direct a viewer's eyes through a work of art.
D. How something feels or how it looks like it would feel.
"Unity is a principle of art that makes all the elements and/or parts of an artwork feel unified, as if all the parts go together. It also gives an artwork a sense of feeling complete and/or finished."
C. When an art element (or elements) is repeated in a planned or random way over and over again.