A skeletal frame constructed in a regular pattern to support the floors, roof, or walls. A steel frame is made up of vertical steel columns and horizontal I-beams
It should be C!!!!!!!!!!!!!!!!!
Explanation:
Negative spaces are empty spaces that acquire a sense of volume and form by means of the outline or frame that surrounds them. Negative spaces can be used to suggest form. ... By means of illusion, a sense of depth or 3 dimensions an be achieved on a flat surface.