The appropriate choice to complete the sentence would be: c. meaningful
The term "sculpture" refers to a three-dimensional work of art that can take various forms and is created by shaping or combining materials. In the given context, the adjective used to describe the sculpture is intended to convey a sense of significance or depth beyond just its physical appearance.
Therefore, the most fitting option is "meaningful." This suggests that a sculpture is not merely aesthetically pleasing but also possesses a deeper, thought-provoking quality or purpose that goes beyond its visual characteristics.