Answer:
C: They often lived in overcrowded neighborhoods with poor sanitation and disease.
Step-by-step explanation:
As you can read on the excerpt the population rose from 88,000 to almost 3 million in only a century, this meant that the city was not prepared for hosting all of those persons, worst than that socially there were no opportunities like enough schools, enough buildings to live in, this created overcrowded nighborhoods with poor sanitation condition and diseases.