D. the Brain Trust encouraged FDR to make the banks take a "holiday" when he became President.
The Brain Trust was a group of academic advisors who helped FDR develop policies during his presidential campaign and after he took office. They consisted of economists, lawyers, and other experts who had a progressive outlook and believed in using government intervention to address social and economic problems. According to historian William Leuchtenburg, the Brain Trust "had formulated a plan for the President to cope with the banking crisis," which included the idea of a "bank holiday" to give the government time to reorganize and stabilize the banking system (Leuchtenburg, 1995, p. 141). FDR ultimately embraced this idea and declared a four-day bank holiday on March 6, 1933, which was followed by the Emergency Banking Act to restore confidence in the banking system.