Which of the following did not occur during roosevelt's first 100 days in office? a. he called special sessions of congress. b. many pieces of his new deal legislation were enacted. c. he worked to end isolationist sentiment in the united states. d. he called a four-day bank "holiday."

C--he worked to end isolationist policy--FDR did not do anything with foreign policy during his first 100 days. 

FDR would maintain the isolationist policy in his first two terms as president. He signed Neutrality Acts through 1937. In his third term (elected in 1940), he began moves toward war preparing the US for World War II.