Answer:
I think is (D) is the only one that makes more scenes
I think the casket is a symbol of death and it is also a symbol of cruelty of the narrator that he took Doodle to see it and touch it to emphasize that they thought he was going to die so needed to be brought face to face with it.
A. To inform
The passage is trying to inform you on what happen if you plagarise or what plagiarism is.
It is a reflection because it happened in the past and the character is going back in their thoughts