If this is an actual question then ...
Why school as a concept, our schools in particular and our classrooms exist is a matter of great importance to designing classrooms that teach (higher order thinking) skills and successfully challenge students. We do it so we can challenge students' existing skills and help them grow as a result.
If not then it’s because people want to hurt us by making us go to school.
The South based its economy on the use of slaves for agricultural production of things like cotton and tobacco. The North had significant amounts of industry and other finished goods. The South could supply some of the raw materials for the industry of the North. Regardless, the North relied on paid labor.
Either A. or D. Kinda hard to tell but I tried.