What Combination of Factors Turned the Tide and Led to the Allied

What combination of factors turned the tide and led to the Allied victory?

A) American industrial productivity and the Soviet Union's ability to absorb and ultimately repel the German invasion
B) frequent use of superior American tanks and British planes that outmatched their German equivalents
C) Japan's defection to the Allies after the dropping of the atomic bombs and Germany's invasion of Britain
D) the decrease in size and power of the federal government and the expansion of federal and state power
E) President Roosevelt's loss of the 1944 Democratic nomination to Harry Truman and Hitler's failing health