Progressives believed they could accomplish their goals through government a. de-regulation c. by-laws b. regulation d. all of the above

The correct answer is C.

The Progressive movement aimed to remove the problems that the industrialization process,  and others derived from it, such as urbanization or immigration had brought, and it also focused on the fight against political corruption. Dealing with these issues required to regulate and to create new legislation to govern these new realities and also rules to limit corrupt practices, because awareness about them was massively raised for the first time during the Progressive era.