I think the answer is an outline.
I'm pretty sure it's "the baby cried" because an independent clause can stand alone and that can stand alone.
The answer is effective because the president outlines the emotional reasons for entering war. Hope this helps.
Answer: (date)
Dear (name),
I just heard you are starting secondary school! I just wanted to let you know that there are going to be a couple issues. First, you might have trouble making friends, but dont worry, just be yourself! Second, Bullying, If you are getting bullied, tell a teacher or a trusted adult. Third, finding your classes, if you have trouble finding your classes, ask a teacher for directions!
Stay safe and have a good year!
With love,
(name)