The would be a because it makes more sense than the other sentences. If you read each of them a will make better sense.
I'm pretty sure it is Theme.
Theme is the central topic of the text. passage, story, or anything else. So it may possibly also be the same for the underlying meaning and universal truth...but again, I am not sure.
Answer:
write a letter to the district director of your district telling him about two challenge you face in the school
Probably because they were murdered.
Please vote my answer brainliest. thanks!