Answer:
The best answer is actually E. The tone of the story is somewhat humorous and the mood is uneasy.
Step-by-step explanation:
Even though this excerpt is about something that is supposedly serious - burying someone who has been killed -, the author makes it humorous in a somber way. The characters are clearly uncomfortable with the task at hand. Instead of dealing with it in a solemn manner, their rush to be done with it makes the whole action a bit ridiculous. They are afraid to touch the body, so it "lifted, heaved, toppled, flopped into the grave", which would normally be disrespectful. It is pitiful and funny, however, since we sense the uneasiness of the characters. To make matters worse, they do not know what to say - nor when to say it - once the body is in its grave. Still, they do what they can, even though it isn't much. That's why the story's tone is humorous, and the mood is uneasy.