Which statement most accurately explains why the institution of slavery was continued under the original constitution of the united states

Assuming that this is referring to the same list of options that was posted before with this question, the correct response would be because many of the Founding Fathers who drafted the Constitution owned slaves at the time, and felt that the fragile economy of the new nation would be ruined if they outlawed slavery immediately. 

1. the spread of reform movements aimed at perfecting american society