Concept:Technical qualities in art appreciation refer to the materials, tools, designs, and styles used by the artist.
Explanation:When appreciating a work of art, the examination of tools, materials, designs, and styles helps the viewer understand how the work was made.
These features reveal the artist's skill, methods, and the physical or visual techniques applied.
Therefore, such features determine the technical qualities of the artwork.
Answer:C. technical qualities of the work.