Progressive Era journalists known as 'muckrakers,' such as Upton Sinclair, are best described as writers who
Aexposed corruption and social problems to push for reform
Bencouraged rapid westward expansion
Cdefended big-business monopolies
Dopposed women’s suffrage
Explanation
Muckrakers investigated abuses in business and government; Sinclair’s 'The Jungle' (1906) helped lead to federal food-safety laws.