Why was the d-day invasion crucial for the allies’ europe first strategy? the invasion forced germany to surrender. the invasion ended german ambitions to invade the united states. the invasion was key in forcing the germans to retreat east. the invasion exhausted german supplies and weakened their defenses.

Option C. The Normandy battle was important in making the Germans retreat to the East. This Operation was called Operation overlord which was implemented by the Allied forces. British, American and Canadian multitudes of soldiers who surreptitiously landed on the French coastline called Normandy formed to be the Allied forces.

Aggressive battle between the allied troops and Nazi militaries commanded by Hitler made the Germans to run back to their own country.

D-Day invasion is the other name of battle of Normandy.  

b - those executed came from every social and economic class

equal area projections

equal-area projection. a projection in which regions on the earth's surface that are of equal area are represented as equal.