Question

what is d-day?
the day the united states entered the war in europe
the day the allies launched a massive assault on nazi-occupied france
the day the allied troops marched into paris
the day the united states dropped the atomic bomb on nagasaki

Explanation:

D - Day refers to June 6, 1944, when the Allied forces (including the US, UK, Canada, etc.) launched a massive amphibious assault on the beaches of Normandy, which was under Nazi occupation in France. The US entered the European war earlier (after Pearl Harbor and through operations like North Africa). Allied troops marched into Paris later (August 1944), and the atomic bomb on Nagasaki was in August 1945 in the Pacific theater, not related to D - Day.

Answer:

B. the day the Allies launched a massive assault on Nazi - occupied France