(A) They allowed the Allied Powers to attack all Germany’s forces at once.
(B) ** They forced Germany to fight on multiple fronts, which divided and weakened its military strength.
(C) They showed the effectiveness and safety of beach invasions, which led to more successful Allied invasions.
EXPLANATIONS BELOW
Concept note-1: -The war would not be over by Christmas. But D-Day had opened another major front, where the bulk of America’s rapidly expanding army could at last be brought to bear. It led to the liberation of France, denying Germany any further exploitation of that country’s economic and manpower resources.
Concept note-2: -The D-Day operation of June 6, 1944, brought together the land, air, and sea forces of the allied armies in what became known as the largest invasion force in human history. The operation, given the codename OVERLORD, delivered five naval assault divisions to the beaches of Normandy, France.