Final answer:
Artist Louise Nevelson used the process of assemblage to create the artwork Sky Cathedral, which involves combining found objects into a new sculptural form.
Step-by-step explanation:
In the artwork Sky Cathedral, artist Louise Nevelson utilized a process known as assemblage to combine found materials into a sculpture. Assemblage involves artists using found, manufactured, or altered objects, which they join together using methods like welding, gluing, bolting, or wiring to create a new and unique form. By cutting and shaping pieces of wood, then gluing and nailing them together, and finally painting them a single tone, Nevelson's sculptures achieve graphic and textural qualities that play with shapes, patterns, and shadows to form her complex compositions. Therefore, the process used by Louise Nevelson in creating Sky Cathedral is best described by option B) Assemblage.