The power of death is a dominant theme
The use of third person narration allows the author to tell the story from the perspective of what is seen and done and not what the character think or thought. This narration style helped the author to effectively handle the surprise climax at the end of the story.
Well, since you didn't share any options to choose the correct one, I can only guess whether I can help you. But I have some valuable and useful information though. In most of the situation you can come across how one author is dominated by facts, while other is dominated by images and examples and descriptions and so on.
Do hope it helps!
When we're old, wise and grey. Or by the way we portray ourselves, people can learn a lot about us.