Which of the Following Occurred at Dunkirk in 1940

Which of the following occurred at Dunkirk in 1940?

A) a confrontation between French and German troops that convinced the Allies they would lose the war
B) the evacuation of hundreds of thousands of British troops from a French port, the success of which boosted British morale
C) a largely unsuccessful meeting during which Winston Churchill sought terms with the German colossus
D) the return of French civilians after having fled much of France two years prior
E) a major aerial duel of German and British forces that came to be known as the Battle of Britain