The deplorable working conditions that many american laborers were forced to endure led to the rise of muckrakers, such as upton sinclair, in the early twentieth century. which of the following best describes the types of individuals to whom the term "muckraker" refers?
a. radical nativists whose writing sought to convince the government to regulate immigration. b. playwrights who turned the social struggles of american laborers into popular stage productionsc. economic writers who charted the rise of american industry and the social changes it brought about. d. investigative journalists whose work sought to bring about social reform and relief for the lowerclasses.

The answer is: D. Investigative journalists whose work sought to bring about social reform and relief for the lower classes.

Explanation:

According to the Cambridge Dictionary, muckraker is a person, especially one in a news organization, who tries to find out unpleasant information about people or organizations in order to make it public.

Upton Sinclair was an American novelist, essayist, playwright, and short-story writer, who wrote  "The Jungle" a 1906 novel . It was written to portray the harsh conditions and exploited lives of immigrants in the United States in Chicago and similar industrialized cities.

c) troops march forward in close formation against newer, more accurate weapons