(GIVING BRAINLIEST!!) Why were there so many slaves in the Southern colonies?

A) They were needed to work in harbors.
B)There was a high demand in the South for skilled laborers.
C) They were needed to work on large plantations producing cash crops.
D) There was a high demand for laborers with boating skills.

Urban growth invariably feeds increased commercialization and industrialization. it requires continually expanding land areas. when urbanization rates are high, and countries do not have the institutional and managerial capacities or economic wherewithal to manage such rapid growths, they exert intense pressure on the types and nature of the resulting settlements. they contribute to the development of overcrowded slums and shanty towns without adequate essential services and necessary infrastructure.-by asit k. biswas and cecilia tortajada