Which of the following was a belief held by progressive reformers

The answer is B, big businesses should be regulated by government to help small businesses. The Progressive Era was a time of broad social activism and political change over the United States, from the 1890s to 1920s. The primary target of the Progressive development was dispensing with debasement in government. The development fundamentally focused on political machines and their managers.

February 1848 is when it was added. if that's what you were asking