one mostly negative effect of urbanization wa...

# Brief Explanations: Urbanization led to a rapid influx of people to cities. Inadequate housing and living - condition planning resulted in the growth of slums, which are areas of extreme poverty, poor sanitation, and social problems. Factories and railroads were part of industrialization and had both positive and negative aspects. Stockyards are related to meat - packing and livestock industries and not the most representative negative of urbanization. # Answer: C. slums