Which statement best explains why immigrants and factory owners worked together but often lived in different parts of a city?

The question is asking "Which statement best explains why immigrants and factory owners worked together but often lived in different parts of a city?", but, unfortunately, the options are missing. However, we can understand that the immigrants worked in the factories for the factory owners - which would mean that they were paid less than the factory owners. The factory owners then presumably lived in more expensive areas that the immigrants would not be able to live in.