The principle of design that suggests a structural relationship between different elements within a work of art is **A. unity**.
- Unity in art refers to the cohesive relationship between various elements in a piece that creates a sense of harmony and completeness.
- It helps tie together the different components of a composition, giving it a sense of wholeness and organization.
- This principle ensures that all elements work together to convey a single idea or theme, creating a visually pleasing and well-integrated artwork.
Therefore, unity is the principle of design that emphasizes the structural relationship between different elements in a work of art.
