Write the next sentence in the following story.

How to write a letter to your future self
Choose an age.
Before doing anything else, decide how old you want your future self to be when you read this letter. You may want to read the letter when you're 18 , 25, or 30 years old.

Choose from:
[I] Choosing an age will help you define the goals you want to achieve by that time in your life. You may want to choose an age that puts you in different circumstances than you are currently in.
[II] If that's the case, pick a child, what age, if any, you want your future self to be. However, if you're writing to a child, try to avoid anything beyond 20-30 or 30.
[III] Go back and read it several times to figure out how old it is. It can help to ask yourself what you would want to be in the future.
[IV] These are the ideal ages for most people to read the letter. Don't make your opportunity to read the letter a trap.. The answer should be
[I]