The correct answer is D, that to encourage people to take action against widespread corruption
The "Muckrakers" were crusading journalists, authors and photographers who published their work in order to raise awareness on social issues and injustice. Other muckrakers highlighted the deficiencies in the political system. Their newspapers, articles and photographs led to the formation of influence groups sparking a series of reforms during the Progressive Era (1890 - 1920). Raising awareness of social injustice, corruption and inequality and the abuse of political power was their main goal in order to bring about the reform.
