Answer: C. large but detailed in decoration
Romanesque architecture is typically characterized by thick, heavy walls that are sturdy, and can support stone roofs, so option A is out. Roman buildings and structures are built in a way that the exterior is almost the same as the interior of the building, so option D is out. The Roman architecture boasts of having buildings that may be large, but are simple in design. The appearances are often black, or similar to earthen colors, so B is out.