Final answer:
The city that was liberated by the Allied forces two days before the D-Day invasion of Normandy was 4) Rome. The liberation of Rome had important strategic implications and was followed by the historic D-Day landing, which led to the eventual liberation of Paris and most of France.
Step-by-step explanation:
The Allied forces liberated 4) Rome just two days before a major battle in Normandy. On the same day the American army entered Rome, the Allies launched Operation Overlord, which was also known as D-Day, the allied invasion of France.
This operation marked the beginning of the end for Nazi-occupied Europe, with Allied troops storming the beaches of Normandy and successfully establishing a beachhead.
Paris, on the other hand, was liberated later, in late August 1944, two months after the D-Day landings. The liberation of Rome was significant as it not only removed Italy from the war, but also provided strategic advantages to the Allies in the Mediterranean.