Answer:
Upton Sinclair's The Jungle affected Progressive reform as it led to workplace reform to remedy the hazardous and sometimes fatal conditions.
Step-by-step explanation:
The Jungle is a socially critical novel by Upton Sinclair. Using the example of an immigrant family from Lithuania, Sinclair illustrated the catastrophic effects of capitalism dictated by profiteering and corruption at the end of the 19th century. Specifically, he described the exploitation of the workers and the hygienic ills in the slaughterhouses and canneries in the Union Stockyards of Chicago. He triggered a public scandal, which eventually led to legislative changes.