Answer: D. Unrecognizable
Explanation: Artworks that are non-objective uses geometric forms, clean edges, flat planes, lines, shapes and simplified dimensions to emphasize flatness. In this their subject matter is unrecognizable unlike those of objective art where you can recognize say a tree or something else; specific objects are represented here. Non-objective art is also known as abstract or non-representational or concrete art. They describe any type of abstract art (including abstract sculpture) which is wholly devoid of any reference to the natural world.