In the Context of the Issues Regarding Slave Importation,which of the Following

In the context of the issues regarding slave importation,which of the following statements is true about the settlement that was reached at the Constitutional Convention? 

A)  The South won fifty years of unrestricted slave trade by agreeing to its prohibition thereafter. 
B)  Slaves were not considered as part of a state's population. 
C)  Slaves who had fled to the northern states had to be returned to their owners. 
D)  Domestic slave trading was banned immediately after the Convention. 
E)  Slaves who had escaped to the northern states were considered free.