Ida Tarbell's article, "The History of the Standard Oil Company" was an example of which of the following? a. Progressive Era muckraking journalism
b. Gilded Age pro-capitalist public relations
c. 19th-century objective historiography
d. Social Party anti-capitalist propaganda

a. Progressive Era muckraking journalism

Explanation:

In the late 19th and very early 20th century, there developed very rich and powerful company executives that took advantage of the lack of proper business laws in the United States to amass a fortune being anti-competitive and committing what would today be termed as labor violations.

There developed journalists like Ida Tarbell who were dedicated to exposing these executives in what was called "muckraking journalism". This particular article by Ida Tarbell was a muckraking journalistic work focusing on John D. Rockefeller.

answer; (d) i believe that the correct answer is americans finally ran out of ammunition;

the answer is mass marketing.