Read the excerpt from Edgar Allan Poe's "The Pit and the Pendulum." What is the setting?

In feeling my way I had found many angles, and thus deduced an idea of great irregularity; so potent is the effect of total darkness upon one arousing from lethargy or sleep! The angles were simply those of a few slight depressions, or niches, at odd intervals . . . What I had taken for masonry seemed now to be iron, or some other metal, in huge plates, whose sutures or joints occasioned the depression. The entire surface of this metallic enclosure was rudely daubed in all the hideous and repulsive devices to which the charnel superstition of the monks has given rise. The figures of fiends in aspects of menace, with skeleton forms, and other more really fearful images, overspread and disfigured the walls. I observed that the outlines of these monstrosities were sufficiently distinct, but that the colors seemed faded and blurred, as if from the effects of a damp atmosphere. I now noticed the floor, too, which was of stone.

A.
a dungeon
B.
a house
C.
a courtroom
D.
a maze