17. Leo: Oh no, I'm out of money again this month!

Sherry: How did that happen? Didn't you plan your budget?

Leo: Not really... I usually just spend what I have without thinking ahead.

Sherry: That's why _________ It helps you avoid problems and get ready for the future.
(A)it's necessary to manage your finances early.
(B)you should spend your money once you earn it.
(C)it's acceptable to think about money until later.
(D)you can ignore budgeting when you are young.