Final answer:
The b) Populist Movement influenced the federal government to take on some responsibility for public welfare by advocating for reforms and policies that benefited farmers and working-class Americans.
Step-by-step explanation:
The impact of the Populist Movement on the role of the federal government in American society can be best described by option b) Populists influenced the federal government to take on some responsibility for public welfare.
The Populist Movement, also known as the People's Party, emerged in the late 19th century as a response to economic hardships faced by farmers and workers. The Populists advocated for reforms that aimed to address the concerns of farmers and working-class Americans.
Through their activism and political engagement, the Populists were able to influence the federal government to take action on issues such as regulating railroads, implementing income taxes, and supporting policies that would benefit ordinary people.