By the 1850s, the south was totally committed to a society based on: a. rice and indigo b. cotton and slaves c. slaves

The answer would be B, cotton and slaves.

where is the section with the question?

disequilibrium means that either supply is greater than the demand for an available good, or that the demand for a product outstrips the available supply. it implies that the price for a is either too low creating large demand, or too high creating a large surplus of supply.