Which statement explains the significance of the British loss at Dunkirk?

A. It led to Germany invading the Soviet Union.
B. It led to the United States supplying weapons to the British.
C. It led to the Soviet Union declaring war on Germany.
D. It led to improved morale of British people

D. It led to improved morale of British people

The successful evacuation of British and Allied troops from Dunkirk in 1940, despite heavy losses, boosted the morale of the British people and inspired hope in the face of overwhelming odds. This led to a sense of resilience and determination among the British population, which helped sustain them through the difficult early stages of World War II.