Answer:
D . address the fact that Vonnegut's books were burned at the school.
Step-by-step explanation:
The opening words of the text provide us with the reason why Vonnegut was writing to Mr. McCarthy. Apparently, the books written by Vonnegut were among the books that were burned at Mr. McCarthy's school. His books were described as evil and this made Vonnegut unhappy.
Since the school authorities also viewed writers and their books as unreal, Vonnegut was now writing to Mr. McCarthy on a personal level to show him that he was a real person. He also wrote to address the fact that his books were burned.