The answer is: A. He seems unaware that his decisions are the cause of all of the problems.
In “Top of the food chain” is a short story wrote by T. Coraghessan Boyle, in this story he wanted to show how mean and selfish is the human nature with the nature and this is the purpose of the narrator who goes telling the story of how all his selfish decisions affected his surroundings and shows his indifference to that problem.