Answer:
B. believing that the war was over
Step-by-step explanation:
D-Day refers to the date June 6, 1944, when American, British and Canadian forces landed in Normandy. This battle extended to August of the same year and represented the liberation of Western Europe from Nazi's control.
So, the Allies displayed a large military assult against the Germans. The following spring to that battle, the Germans were defeated. The Normandy landings are called the beginning the end of the war, at least in Europe.
Therefore, the right answer should be B.