People who live in poor, overcrowded urban areas, or are unable to meet their basic needs.
a. urban areas
b. slums
c. rural areas
d. suburbs

B. slums

Industrialisation affected the poor in a way that they, as manual labors, were replaced by machinery in order to do the tasks or jobs that were usually done manually. During industrialisation, agricultural society was replaced to a manufacturing one. Because of this, there was a lower demand for workers as many lost their jobs because of machinations. Due to the higher demand for jobs by these people, many of the poor people accepted jobs with low wages to compete for those others who are also in need of jobs.  

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