Answer:
The correct answer is D. Worked to expose problems in business and politics.
Explanation:
Lincoln Joseph Steffens was an American journalist who was known for making investigations in terms of corruption in municipal governments. This was an issue that was presented in some American cities.
He also was one of the leaders of muckraker's movement in the Progressive Era during the early 20th century. He wrote some articles in McClure's, and he included them in his book The Shame of the Cities had.
