The most accurate statement regarding the position of the northern states toward slavery during the Constitutional Convention is:
Most northern states likely wanted to ban the practice of enslaving people.
While not all northern states had completely abolished slavery by the time of the Constitutional Convention in 1787, there was a growing sentiment against it in the North, and many northern delegates favored measures that would lead to the eventual abolition of slavery. However, it is important to note that there were also divisions among northern states, and their positions varied. The other statements are not entirely accurate in reflecting the general consensus among northern states at that time.