During the Progressive Era, a primary goal of political reforms was to address social issues and improve working conditions. Therefore, the correct answer among the options provided is:
B) Ensure safe working conditions.
While allowing indirect election of senators (Option A) did occur as a result of the Progressive movement (through the 17th Amendment), the broader and more significant goal was to improve social welfare, which included ensuring safe working conditions. Option C, providing more common drinking cups, is less relevant to the major goals of the Progressive Era.