The correct answer is A. 1940.
Germany invaded France on May 10, 1940, in the opening move of the Battle of France. The German army, led by General Heinz Guderian, broke through the French defenses in the Ardennes Forest and quickly advanced towards the English Channel. The French army was caught off guard and was quickly defeated. On June 22, 1940, France signed an armistice with Germany, and the country was divided into two zones: an occupied zone in the north and west, and an unoccupied zone in the south.
The invasion of France was a major turning point in World War II. It led to the fall of France and the establishment of a collaborationist government under Marshal Philippe Pétain. It also opened up the possibility of a German invasion of Britain.
The other options are incorrect. Option B is incorrect because Germany invaded the Soviet Union in 1941. Option C is incorrect because Germany invaded North Africa in 1942. Option D is incorrect because Germany invaded Italy in 1943.