The correct answer is A) The scope of its power increased.
During World War I, the US government got heavily involved in the American economy. The federal government created agencies that told American businesses what to produce and how much to produce. This control of the American economy was implemented to ensure that the United States military had enough resources during World War I.
Along with this, the federal government developed propaganda campaigns to help individuals reduce the amount of resources they consumed so that military personnel would have enough food to live on. These actions showed a huge increase in the federal governments role in American society.