Explanation:
Upton Sinclair’s motivation for writing “The Jungle” primarily stemmed from his fervent commitment to exposing the harsh realities of labor exploitation and the appalling conditions in the American meatpacking industry during the early 20th century. Inspired by his socialist beliefs and a desire for social reform, Sinclair aimed to shed light on the deplorable working conditions, health hazards, and rampant corruption that plagued the lives of immigrant workers, in order to incite public awareness and provoke change in the prevailing socio-economic system.