Answer:
A. The cities were dirty and dangerous
Step-by-step explanation:
Suburb is a proper term of the urban geography, coming from the Latin suburbium, to designate to the residential zones of the urban periphery or outskirts; while properly speaking in Spanish the concept designates the slums, poor, marginalized or degraded of those peripheral areas far from the center of the city.
The characteristics of the suburban or suburban areas, in the sense that it is given in American urbanism, are determined by the social component of its population: young working-class people, who settle down in scattered minor multinuclei close to the city and communicate with good road systems towards the peripheries. The model of coexistence of social life is by friendships in public spaces, schools, squares, parties, etc., which gives uniformity to services and institutions and a quality of life of habitability superior to the city: green spaces, open landscape, etc., but transferring the same problems if planning is not taken care of and the factors that have caused the cities to decline are avoided, sometimes due to issues of social justice in relation to educational, health and leisure institutions, among others.