The correct answer is true.
It is true that settlement houses multi-family urban-dwelling were often overcrowded and unsanitary.
The Industrial Revolutions brought many benefits to people but also had disadvantages. Millions of people from Europ and Asia arrived in the United States, looking for better living conditions. People that lived in rural areas of the United States decided to move to larger cities where the factories and jobs were. This affected the cities in that many neighborhoods saw how families lived in overcrowded places with unhealthy conditions and lack of ventilation, which represented a risk dor diseases.