Final answer:
The subject of this question is English, and the correct answer is D) Diary.
Step-by-step explanation:
The subject of this question is English and it is suitable for Middle School grade level. In the question, the student is asking what communication method Harry used to write a note that Tom replied to. The correct answer is D) Diary. In the Harry Potter series, Harry writes in his diary and Tom Riddle, who is the memory of Lord Voldemort, communicates with him through the diary.