As the narrator is rushing out of this house, what happens to the house?

all the lights in the house flash on and off wildly while the narrator hears a creepy howling sound.
the house erupts in flames.
the house is struck by lightning.
the crack in the house splits open and the house falls into the moat.

the fall of the house of usher

According to the options stated, the one which is correct is the last one: “The crack in the house splits open and the house falls into the moat”. The House of Usher, which can be assumed that is some house of somewhere in Europe in the 1800s, splits apart and collapsed by wiping away the remnants of the ancient family. Besides, Poe used a metaphor to resemble the fall of the House itself as an old decaying entity in itself.

from the excerpt from the "the dark game" the reader can infer that folke cronholm was spying for the allied nations.