Respuesta :
Option (d) is the correct answer for explaining urbanization.
What is Urbanization?
Thousands (or millions) of people relocate from the countryside to the city as part of the urbanization process.
A rise in the number of employment available in cities usually triggers a period of rapid urbanization.
This was certainly the case in American history throughout the 1920s when millions of people relocated to the cities due to the increased number of factory jobs available.
Therefore, The concentration of the population in cities is urbanization.
For more information about urbanization, refer below
https://brainly.com/question/7531954
