The individual who would MOST LIKELY have benefited from the Progressive reforms that Jane Addams championed is:
an immigrant living in unsanitary living conditions.
Jane Addams was a prominent figure in the Progressive Era known for her focus on social reform, particularly in improving living conditions for the poor, advocating for immigrants, and addressing social injustice. Her work at Hull House and other initiatives aimed to support those in need, particularly immigrants facing challenges in urban settings.