The answer is d. London. During World War II, Hitler had most of Western Europe. After it had conquered France on June 10, 1940, The Germans now concentrated on Great Britain and began a relentless bombing campaign on the City in 1941. Though it bombed London constantly, the British people rallied and resist the Germans. The British Royal Air Force fought the German Luftwaffe to defend their country. The British navy was another factor to preventing German assaults by sea. With the aid of the American supplies through the Lead-Lease Act, the British weathered out the German attacks and the German ended in failure.