Answer:
c.) focused on the wretched conditions of New York City slums.
Explanation:
How the other Half Lives is a photojournalism work done by Jacob Riisa, and it is a collection of photographs of the reality that the people living in the New York City Slums in early 1880´s, so we focused on the wretched conditions of New York City slums, by exposing the reality of how the poor half of the city lived he made a case for the inequalities that existed in the city.