If you want to impress your teacher you could also write that it's also necessary to have a look at the arguments that back child labour.
In many cases the parents simply don't gain enough money for the whole family, so the children have to work for their own food. If you want the parents to send their children to school you need to offer a place where the students can have a free meal so that they are no burden for their parents.
If you just make a law that forbids child labour, the situation of the people will get worse. And at that point, when the children don't work anymore, they start to roam the streets and make their living of stealing or other criminal activities.

Und damit es leichter fällt, das einzubauen, habe ich es gleich auf Englisch geschrieben. ;-)
Ein schlechter Lehrer würde dir dafür dann zwar ein "Thema verfehlt" reindrücken, aber es gehört nuneinmal dazu.