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Answer:
D. The corruption of the good by the forces of evil and selfishness
Explanation:
War is always, and should always, be talked about in a negative connotation. In this case, the "forces of evil" is the negative experiences that the officer has obtained, whether it was the death of close comerades, or the experiences of first-hand killing of enemies. When one has seen the negatives of life in the underworld of war, the old age beliefs of honor within a battlefield is but lost. As such, when the virginity of a person's innocence is destroyed by the harrowing experiences, and, most likely, the close view of death, they lose interest of the every-day blessings, such as that they cannot get over the nightmares (PTSD). When the goodness of the world has been removed, and one is only exposed to the worse, the viewpoints of one become narcisistic, and the joys of life loses it's color and prestige within one's life.
The person narrating has committed a murder and shoved the corpse under his floorboards. As some time passes the heart beat is a glimpse into his insanity, and how he is delusional over hearing non existent sounds. He believes he hears the heart of the person he murdered under the floorboards, which is a delusion, most likely made out of paranoia. When the police come to ask about the victim, the man almost fools them until he breaks down and confesses. He expressed annoyance at the victim earlier, saying that he could not get away from their eye, I believe. He tried to solve this by killing them, but his mind would not let him do so by making up false realities.
The satanic ritual in the forest where YGB yells out for Faith to resist.
I hope it helped