Answer:
A. a single color and repeated box shapes create unity
Step-by-step explanation:
"Louise Nevelson" was an American sculptor who made her artwork with mostly wood pieces. These pieces were portrayed like they all belong together, particularly in a monochromatic unity (that is, in black and white). She made her sculptures through "abstract" means. For her, "black" color means "totality" because it is the most aristocratic color. Using only these colors allows her to have discipline in doing art.
So, this explains the answer.