Jacob Riis in How the Other Half Lives was describing the living conditions of (1) workers in urban slums.
What did Jacob Riis talk about?
In the book, "How the Other Half Lives," Jacob Riis wanted the rest of America to know how terrible to conditions were in the New York slums.
These slums were populated by people who worked in the industries of New York and could not afford better housing so stayed in urban slums.
In conclusion, option I is correct.
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