Final answer:
Jacob Riis's book How the Other Half Lives exemplified muckraking journalism, as called by Theodore Roosevelt. It shed light on the poor living conditions in New York City and advocated for social reforms.
Step-by-step explanation:
Jacob Riis's book How the Other Half Lives was an example of what Theodore Roosevelt called muckraking journalism. Muckraking journalism is a type of investigative journalism that exposes corruption, inequalities, and social issues. Riis's book, published in 1890, documented the living conditions of the poor in New York City and brought attention to the need for social reforms.
Learn more about Muckraking journalism