Amuckraker was a reporter who wrote about corruption and crime in industry and government.
a) fictional stories for newspapers and magazines.
b) about the importance of the first amendment.
c) editorials supporting industry leaders and big business practice

A) Fictional and crime in industry and government is the correct answer.

Explanation:

The reform minded journalists of the progressive era were known as the Muckrakers. They were mostly engaged in exposing institutions and corrupt institutions, their articles were published in popular magazines. Investigative  journalism is the modern term for muckrakers. S.S McClure was one of the most famous magazines of Progressive Era that published about the monopolies and the political machines.

c.

worked constantly and gave many sincere speeches about the importance of independence

i believe your answer is d)