The correct answer is D. Paris was the first European capital liberated following the successful D-Day invasion. Although Rome was liberated before Paris, on June 4, 1944, it was also liberated two days before D-Day started.
The landing on Normandy on June 6, 1944, began the Battle of Normandy, whose favorable outcome for the Allies made possible their advance towards the east of France with the aim of reaching the Rhine river line and, subsequently, penetrate into German territory as the quickest way to end the war.
In that context, on August 19 the allied forces arrived in Paris, whose liberation took place six days later, on August 25.