The kind of slavery generally practiced in the new world was?

There were three kinds of slavery commonly practiced in the new world. At first there was enslaving the locals which proved to be ineffective and was soon outlawed. There was indentured servitude where slaves would only be slaves until they paid off their debts and this was ineffective too. The most common later became buying African-American slaves from the Atlantic slave trade which became predominant.

The answer is d.  the north had organized schools, whereas the south had few organized schools.