The “other half” that Jacob Riis referred to in his 1890 book, ''How the Other Half Lives'', were the working poor. Therefore, the option C holds true.
What is the significance of ''How the Other Half Lives''?
The book by Jacob Riis, ''How the Other Half Lives'' explains the condition of the urban American society towards the end of the nineteenth century, and conditions of people's lives, especially after the movement of urbanization caught up pace.
In this book, the term ''other half'' is used to explain the working poor class that lives in the urban American society, but their living conditions are completely different from the other classes living in the same cities. It shows the miserable life poor class living in the cities face.
Therefore, the option C holds true regarding the significance of ''How the Other Half Lives''.
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