Logically, Plan B will work better. Because when you yourself supply money to your child, he will not know about the amount of work that needs to be done to earn money. Due to which he will never be literate to work hard. And when you stop supplying money, a financial deficiency will appear in him and that is why he will work hard and earn money due to his need. And at that time, of course, you will get a better result than him. So I will support Plan B. Plan A can also work, but its chances will be very less.