I say the antagonist, because the devil is agaisnt the main protaginist.
C. Just had this question myself
Answer:
Explanation:
Dear Paul,
You may be wondering why I was so hard on you, it was because I was you.
My parents died while I was in high school and I was sent to live with my aunt. I skipped school, and spent a lot of my time with a shady crowd, which I ended up dropping out of school so that I could earn money to support myself. It wasn't until years later I realized that I never expected much out of myself. If you're reading this letter then you figured out what I did much sooner than I did.
Yours Truly,
Roger