Which was not a mistake that Hitler made during World War II which cost him the war

The Blitzkrieg of France. The battle of Britain was a slight blunder. The Luftwaffe failed. However, if they deprived Britain or sought peace the war would have ended differently. Hitler's "true" enemy was the communists.

1. where does the energy of a nuclear power plant come from?

d) political bosses should not hold office

your answer will most likely be a.