Which statement describes the long term impact of the civil war?

Guys I need help with this world history question. I’m stuck between a or b, but I don’t know. What do you guys think? It’s says long term, so that means for a long periodically time. Debt peonage was outlawed like a 3-5 years after the civil war. That isn’t very long term. But I’m a bit confused with ‘a’ too. What do you guys think. A,b,c,or d?

Which statement describes the long term impact of the civil war Guys I need help with this world history question Im stuck between a or b but I dont know What d class=