Which of These Is a Distinctive Feature of the Southern

Which of these is a distinctive feature of the southern agricultural system?

A) Crops like cotton, rice, and sugar could be grown only in the South, which also wore out the soil and damaged the environment.
B) Its dependence on staple crops caused great economic displacement for Northern businesses.
C) Its rural agricultural economy was more stable but less profitable than the boom-and-bust cycles of the industrializing North.
D) Its rural agricultural economy was not based on the institution of slavery.