Final answer:
Jane Addams founded Hull House in 1889 to help people in city slums, offering educational and social programs in Chicago.
Step-by-step explanation:
Jane Addams assisted people living in city slums primarily through her establishment of Hull House. Addams, a pioneer in social welfare, observed settlement houses while in London and applied her knowledge to create Hull House in Chicago in 1889. This institution focused on aiding needy immigrants and the poor by offering social and educational programs.
Committed to understanding and alleviating poverty, Jane Addams and her colleagues at Hull House, including Ellen Gates Starr and Florence Kelley, worked directly within impoverished communities. Their efforts encompassed a wide range of support services such as childcare, cultural events, and health clinics. Therefore, the correct answer to the provided question is d. Hull House.