D: Studies show that arts programs actually help students perform better in "core" subjects Hike math
Step-by-step explanation:
The boy is writing a letter to the school board, so this letter should be written using formal language without the use of acronyms and slang and should be written with the words denotatively. We do not see this kind of writing in the letter D sentence, where the boy used the word "core" as a slang word and in its connotative sense, leaving the text inappropriate for the situation.
