A. from metropolis, to megapolis, to megacity
B. from country, to suburb, to urban
C. from zone, to sector, to periphery
D. from civilization, to gentrification, to suburbanization
The best and most correct answer among the choices provided by your question is the first choice or letter A. In an urbanization process, the city grows from metropolis, to megapolis, to megacity.
Urbanization is a population shift from rural to urban areas, "the gradual increase in the proportion of people living in urban areas", and the ways in which each society adapts to the change.
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