Answer:
Advocates of unregulated markets and balanced budgets
Explanation:
It is believed that "Advocates of unregulated markets and balanced budgets" would most likely oppose President Franklin Roosevelt's policies during the Great Depression.
This is because the policies of President Franklin Roosevelt during the Great Depression, which is known as the New Deal is based on public work projects, financial and socio-economic improvement that seeks to assist the banking industry, farmers, the unemployed, youth, and the elderly.
These policies are however against the tenets of "Advocates of unregulated markets and balanced budgets" who believed that such policies would affect the business interests of the Americans and as well give the government more control than necessary.