Final answer:
The muckrakers Upton Sinclair, Ida B. Wells, Jacob Riis, Ida Tarbell, and Lincoln Steffens focused on specific societal issues: Sinclair on the meatpacking industry, Wells on racial violence, Riis on tenement living conditions, Tarbell on Standard Oil Company's monopoly, and Steffens on political corruption.
Step-by-step explanation:
Matching each muckraker to the problem that was their intended focus yields the following results:
a. Upton Sinclair iii. Poor working conditions in the meatpacking industry
b. Ida B. Wells v. Racial violence and lynching against African Americans
c. Jacob Riis i. Living conditions in urban slums and tenements
d. Ida Tarbell iv. Monopolistic practices of the Standard Oil Company
e. Lincoln Steffens ii. Political corruption in urban governments
Upton Sinclair's novel The Jungle highlighted the horrific conditions in the Chicago meat-packing industry and contributed to the creation of the Pure Food and Drug Act. Ida B. Wells bravely tackled the issue of racial violence and lynching. Jacob Riis was a pioneer in photojournalism, exposing the plight of those living in tenements. Ida Tarbell meticulously chronicled the monopolistic tactics of Standard Oil. Lincoln Steffens wrote on political corruption, providing insights that helped drive calls for reform.