Answer:
A. ambiguous
Explanation:
When something is ambiguous, it doesn't have a single obvious meaning and it's open to more than one interpretation. When a story is ambiguous, a reader can make their own conclusions about what is going on. Authors often give their works an open ending - a type of ending where the conflict isn't solved. These stories can end in multiple ways, and authors leave it up to their readers to decide how exactly the story has ended.
D. To make the characters more real and believable.
Answer: I believe the answer is D
Explanation: Since the narrator says "I was tormented by what i had done" we can infer that he sees everything in such a way because he feels regret or remorse for that specific action and his outlook on the world at that moment is skewed.