Which Statement Describes the Key to the Transformation That Legitimized

Which statement describes the key to the transformation that legitimized the acquisition of economic powers by the president?

A) Congress and the public insisted that the president solve the nation's economic problems in the aftermath of the Great Depression.
B) The Constitution contains specific language on the presidential economic policymaking powers invoked by Roosevelt.
C) The brief period of martial law at the onset of World War I allowed for a rapid concentration of economic powers in the executive branch.
D) Broad powers were granted to the president by Congress with the passage of the Economic Opportunity Act.