Which of the following artistic elements would be found only in sculpture or decorative arts?

Form is the correct choice because it specifically refers to the three-dimensional quality of an artwork, which is essential in sculpture and decorative arts. Form encompasses the physical volume and mass of an object, distinguishing it from two-dimensional art where only height and width are present. In sculpture, artists manipulate materials to create shapes that occupy space and could be viewed from various angles, making form a fundamental element of this artistic discipline.

While color, texture, and composition can apply to both two-dimensional and three-dimensional works, form is unique to practices like sculpture, where the physicality and spatial relationships create a distinct experience for the viewer. Texture can be found in paintings and drawings as well, while composition primarily relates to the arrangement of elements within a work, regardless of its dimensionality. Thus, form is specifically characteristic of sculpture and decorative arts.