According to UNICEF, which of the following is NOT a source of children for the traffickers?

UNICEF defines child trafficking as the transportation and exploitation of unwilling or unknowing victims. The organization believes that thousands of children are being brought into the UK every year from Africa, Eastern Europe and Asia.
    They are forced to work as prostitutes, domestic servants or in various forms of criminal activity. In recent months cases have emerged in Newcastle and Nottingham, suggesting that traffickers are targeting places where the authorities may be less aware of such activities.
    The UN says that the government should make it a criminal offence to traffic a child for any purpose and should provide money from central funds to help the victims.