Did the abolishment of slavery in Britain and the US have a significant influence on the status of slavery in the world today?

A)No, it is estimated that there are 30 million enslaved persons in the world today including victims of human trafficking in the United States.
B)Yes, there are essentially no signs of slavery in any parts of the world today.
C)Yes, there are pockets of slavery today but it is limited to only third world countries.
D)No, it is estimated that there are 1 million enslaved persons in the world today.