Muckraking reporters (reporting wrongdoing and digging up dirty politicians) were assisted in their cleanup of society by members of the religious community with their progressive religious ideas known as a. pilgrim's progress. c. evangelism. b. the social gospel. d. revivalism.

The correct answer is B) Social Gospel.

During the early 20th century, muckrakers played an important role in American society by exposing several different problems. These ranged from environmental practices, to working conditions, to the living conditions of people in the inner city.

As a means to show their faith, Christians took on the mission of trying to solve these social ills through service. For example, one of the biggest organizations that took on this mission was the Salvation Army. This organization, that still exists today, helped to provide food and shelter for less fortunate American citizens.