Question

upton sinclair, jacob a. riis, and ida tarbell made their greatest contributions to the progressive movement by working to end political corruption in cities speaking out for the equal rights of hispanic americans supporting legislation to improve tenement housing publishing books and articles to expose the problems of society

Explanation:

Upton Sinclair (author of The Jungle exposing unsanitary meatpacking), Jacob A. Riis (photojournalist who documented urban poverty in How the Other Half Lives), and Ida Tarbell (investigative journalist who wrote about corporate monopolies in The History of the Standard Oil Company) were all muckrakers. Their core contribution to the Progressive Movement was using published works to reveal societal and corporate injustices, which spurred reform. The other options are too narrow: they did not focus primarily on political corruption, Hispanic American rights, or only tenement housing legislation.

Answer:

publishing books and articles to expose the problems of society