Question

in the late 1890’s and early 1900’s, the public became aware of the poor housing conditions and the economic distress of many immigrant urban dwellers through the
writings of harriet beecher stowe
activities of the pacifist movement
photographs of jacob riis
campaign platform of the know - nothing party

Explanation:

Jacob Riis was a journalist and photographer in the late 1800s-early 1900s who documented the squalid living conditions of urban immigrant communities in New York City, bringing widespread public attention to their poverty and housing struggles. Harriet Beecher Stowe's work focused on slavery, the pacifist movement centered on anti-war efforts, and the Know-Nothing Party opposed immigration, so these do not match the described scenario.

Answer:

photographs of Jacob Riis