What was the "First Hundred Days"?

A. The time period directly following the stock market crash in 1929, during which banks failed and factories closed at record rates.
B. Hoover's plan for economic recovery in which public works programs built dams and Congress passed legislation raising tariffs on foreign goods.
C. The time in which the United States military mobilized following the attack on Pearl Harbor.
D. The special congressional session called by President Roosevelt after his inauguration to initiate New Deal legislation.